fix isdigit taking unsigned as input
gcc complains because our char might or might not be signed depending on
arch and phase of the moon:
error: array subscript has type 'char' [-Werror=charsubscripts]
Change-Id: I7c76f9a2318c4f0e5eedeea00ec380824b86567e
diff --git a/src/utils.c b/src/utils.c
index 626dcb4..300204a 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1250,7 +1250,7 @@
if (point)
return -EINVAL;
point = p;
- } else if (!isdigit(*p))
+ } else if (!isdigit((unsigned char)*p))
return -EINVAL;
}