Change various types to the correct signedness to avoid warnings.

Also cast the check of "inet_addr" to guint32. The POSIX declaration
of this function returns in_addr_t which is the same as uint32_t.
Windows does not define this type and instead uses unsigned long.

src/common/url.c

@@ -331,7 +331,7 @@ url_check_line (char *buf)
 	GRegex *re(void);
 	GMatchInfo *gmi;
 	char *po = buf;
-	int i;
+	size_t i;
 
 	/* Skip over message prefix */
 	if (*po == ':')