use qemu_* ctype functions

Fix "warning: array subscript has type 'char'" on NetBSD.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd.c b/cmd.c
index ecca167399..f77897e00a 100644
--- a/cmd.c
+++ b/cmd.c
@@ -389,7 +389,7 @@ cvtnum(
 	if (sp[1] != '\0')
 		return -1LL;
 
-	c = tolower(*sp);
+	c = qemu_tolower(*sp);
 	switch (c) {
 	default:
 		return i;