net: more timeouts that reach -1

with while (timeout-- > 0); timeout reaches -1 after the loop, so the tests
below are off by one. also don't do an '< 0' test on an unsigned.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
index 1cf2f94..f3a1274 100644
--- a/drivers/net/arm/ks8695net.c
+++ b/drivers/net/arm/ks8695net.c
@@ -560,7 +560,7 @@
 		msleep(1);
 	}
 
-	if (reset_timeout == 0) {
+	if (reset_timeout < 0) {
 		dev_crit(ksp->dev,
 			 "Timeout waiting for DMA engines to reset\n");
 		/* And blithely carry on */