gianfar: fix signedness issue

irq_of_parse_and_map() has an unsigned return type.
Testing for a negative error value doesn't work here.

Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 49e4ce1246a7..d1bec6269173 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -577,11 +577,10 @@ static int gfar_parse_group(struct device_node *np,
                         irq_of_parse_and_map(np, 1);
                 priv->gfargrp[priv->num_grps].interruptError =
                         irq_of_parse_and_map(np,2);
-                if (priv->gfargrp[priv->num_grps].interruptTransmit < 0 ||
-                        priv->gfargrp[priv->num_grps].interruptReceive < 0 ||
-                        priv->gfargrp[priv->num_grps].interruptError < 0) {
+                if (priv->gfargrp[priv->num_grps].interruptTransmit == NO_IRQ ||
+                    priv->gfargrp[priv->num_grps].interruptReceive  == NO_IRQ ||
+                    priv->gfargrp[priv->num_grps].interruptError    == NO_IRQ)
                         return -EINVAL;
-                }
         }
 
         priv->gfargrp[priv->num_grps].grp_id = priv->num_grps;