Fix compiler warning:

array subscript has type ‘char’ [-Werror=char-subscripts]

diff --git a/src/detect-pcre.c b/src/detect-pcre.c
index 9b16c227509c8277e95b0be14acac1a7ae0383bd..ff45b9245b89bf9155cdff47c7d4c12b287cd253 100644 (file)
--- a/src/detect-pcre.c
+++ b/src/detect-pcre.c
@@ -478,7 +478,7 @@ static DetectPcreData *DetectPcreParse (DetectEngineCtx *de_ctx, char *regexstr,
         } else {
             re_len = strlen(re);
             for (u = 0; u < re_len; u++) {
-                if (isupper(re[u])) {
+                if (isupper((unsigned char)re[u])) {
                     SCLogError(SC_ERR_INVALID_SIGNATURE, "pcre host(\"W\") "
                                "specified has an uppercase char.  "
                                "Since the hostname buffer we match against "