[media] dvb-frontends: get rid of some "always false" warnings

On gcc, enums are generally unsigned, except if a negative value
is declared. Due to that, warnings may happen there:
drivers/media/dvb-frontends/cx22700.c:142:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/cx22700.c:155:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/cx24123.c:341:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/l64781.c:183:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/l64781.c:187:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/mt312.c:552:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
drivers/media/dvb-frontends/mt312.c:560:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
As other compilers might be using signed values, the better is to
keep the checks there, casting the value to avoid the warning.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 7 insertions, 7 deletions

diff --git a/drivers/media/dvb-frontends/cx22700.c b/drivers/media/dvb-frontends/cx22700.c
index f2a90f990ce3..3d399d9a6343 100644
--- a/drivers/media/dvb-frontends/cx22700.c
+++ b/drivers/media/dvb-frontends/cx22700.c
@@ -139,7 +139,7 @@ static int cx22700_set_tps(struct cx22700_state *state,
         if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
                 return -EINVAL;
 
-        if (p->guard_interval < GUARD_INTERVAL_1_32 ||
+        if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
             p->guard_interval > GUARD_INTERVAL_1_4)
                 return -EINVAL;
 
@@ -152,7 +152,7 @@ static int cx22700_set_tps(struct cx22700_state *state,
             p->modulation != QAM_64)
                 return -EINVAL;
 
-        if (p->hierarchy < HIERARCHY_NONE ||
+        if ((int)p->hierarchy < HIERARCHY_NONE ||
             p->hierarchy > HIERARCHY_4)
                 return -EINVAL;
 
diff --git a/drivers/media/dvb-frontends/cx24123.c b/drivers/media/dvb-frontends/cx24123.c
index 7e28b4ee7d4f..68c88ab58e71 100644
--- a/drivers/media/dvb-frontends/cx24123.c
+++ b/drivers/media/dvb-frontends/cx24123.c
@@ -338,7 +338,7 @@ static int cx24123_set_fec(struct cx24123_state *state, fe_code_rate_t fec)
 {
         u8 nom_reg = cx24123_readreg(state, 0x0e) & ~0x07;
 
-        if ((fec < FEC_NONE) || (fec > FEC_AUTO))
+        if (((int)fec < FEC_NONE) || (fec > FEC_AUTO))
                 fec = FEC_AUTO;
 
         /* Set the soft decision threshold */
diff --git a/drivers/media/dvb-frontends/l64781.c b/drivers/media/dvb-frontends/l64781.c
index 36fcf559e361..ddf866c46f8b 100644
--- a/drivers/media/dvb-frontends/l64781.c
+++ b/drivers/media/dvb-frontends/l64781.c
@@ -180,11 +180,11 @@ static int apply_frontend_param(struct dvb_frontend *fe)
             p->transmission_mode != TRANSMISSION_MODE_8K)
                 return -EINVAL;
 
-        if (p->guard_interval < GUARD_INTERVAL_1_32 ||
+        if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
             p->guard_interval > GUARD_INTERVAL_1_4)
                 return -EINVAL;
 
-        if (p->hierarchy < HIERARCHY_NONE ||
+        if ((int)p->hierarchy < HIERARCHY_NONE ||
             p->hierarchy > HIERARCHY_4)
                 return -EINVAL;
 
diff --git a/drivers/media/dvb-frontends/mt312.c b/drivers/media/dvb-frontends/mt312.c
index e20bf13aa860..ec388c1d6913 100644
--- a/drivers/media/dvb-frontends/mt312.c
+++ b/drivers/media/dvb-frontends/mt312.c
@@ -549,7 +549,7 @@ static int mt312_set_frontend(struct dvb_frontend *fe)
             || (p->frequency > fe->ops.info.frequency_max))
                 return -EINVAL;
 
-        if ((p->inversion < INVERSION_OFF)
+        if (((int)p->inversion < INVERSION_OFF)
             || (p->inversion > INVERSION_ON))
                 return -EINVAL;
 
@@ -557,7 +557,7 @@ static int mt312_set_frontend(struct dvb_frontend *fe)
             || (p->symbol_rate > fe->ops.info.symbol_rate_max))
                 return -EINVAL;
 
-        if ((p->fec_inner < FEC_NONE)
+        if (((int)p->fec_inner < FEC_NONE)
             || (p->fec_inner > FEC_AUTO))
                 return -EINVAL;