[PATCH] strtoul() -> strtol() conversion

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/parse.c b/parse.c
index 1e709dd..10d2116 100644
--- a/parse.c
+++ b/parse.c
@@ -56,8 +56,8 @@
 	if (!len)
 		return 1;
 
-	*val = strtoul(str, NULL, 10);
-	if (*val == ULONG_MAX && errno == ERANGE)
+	*val = strtol(str, NULL, 10);
+	if (*val == LONG_MAX && errno == ERANGE)
 		return 1;
 
 	if (kilo)