Tidy some signed/unsigned comparisons

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/utf8.c b/utf8.c
index 56a036b..ffee89d 100644
--- a/utf8.c
+++ b/utf8.c
@@ -199,7 +199,7 @@ static int utf8_map_case(const struct casemap *mapping, int num, int ch)
 static int cmp_range(const void *key, const void *cm)
 {
     const struct utf8range *range = (const struct utf8range *)cm;
-    int ch = *(int *)key;
+    unsigned ch = *(unsigned *)key;
     if (ch < range->lower) {
         return -1;
     }