Index: lib/util_str.c
===================================================================
--- lib/util_str.c	(revision 5865)
+++ lib/util_str.c	(working copy)
@@ -365,14 +365,14 @@
 
 void string_replace(pstring s,char oldc,char newc)
 {
-	unsigned char *p;
+	char *p;
 
 	/* this is quite a common operation, so we want it to be
 	   fast. We optimise for the ascii case, knowing that all our
 	   supported multi-byte character sets are ascii-compatible
 	   (ie. they match for the first 128 chars) */
 
-	for (p = (unsigned char *)s; *p; p++) {
+	for (p = s; *p; p++) {
 		if (*p & 0x80) /* mb string - slow path. */
 			break;
 		if (*p == oldc)