*: optimize code size in strtoul calls

function                                             old     new   delta
bb_parse_mode                                        433     431      -2
rtnl_rtntype_a2n                                     202     198      -4
ParseField                                           511     498     -13
bb_init_module_24                                   4730    4675     -55
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-74)             Total: -74 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/tc.c b/networking/tc.c
index fc47e95..d963694 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -89,7 +89,7 @@
 	if (p == str)
 		return 1;
 	maj <<= 16;
-	if (*p != ':' && *p!=0)
+	if (*p != ':' && *p != '\0')
 		return 1;
  ok:
 	*h = maj;
@@ -119,7 +119,8 @@
 		maj <<= 16;
 		str = p + 1;
 		min = strtoul(str, &p, 16);
-		if (*p != 0 || min >= (1<<16))
+//FIXME: check for "" too?
+		if (*p != '\0' || min >= (1<<16))
 			return 1;
 		maj |= min;
 	} else if (*p != 0)