m68k: cnt reaches -1, not 0

With the postfix decrement cnt reaches -1 rather than 0.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c
index 6e562751ad51..6c74751c7b82 100644
--- a/arch/m68k/amiga/config.c
+++ b/arch/m68k/amiga/config.c
@@ -574,10 +574,11 @@ static int a2000_hwclk(int op, struct rtc_time *t)
 
         tod_2000.cntrl1 = TOD2000_CNTRL1_HOLD;
 
-        while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt--) {
+        while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt) {
                 tod_2000.cntrl1 &= ~TOD2000_CNTRL1_HOLD;
                 udelay(70);
                 tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
+                --cnt;
         }
 
         if (!cnt)
@@ -649,10 +650,11 @@ static int amiga_set_clock_mmss(unsigned long nowtime)
 
                 tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
 
-                while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt--) {
+                while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt) {
                         tod_2000.cntrl1 &= ~TOD2000_CNTRL1_HOLD;
                         udelay(70);
                         tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
+                        --cnt;
                 }
 
                 if (!cnt)