fix this:

trawick · trawick · commit c85d46a3e2c9 · 2009-12-02T17:36:46.000Z
util_mutex.c: In function ‘ap_set_mutex’: util_mutex.c:188: warning: comparison between pointer and integer util_mutex.c:174: warning: unused variable ‘type’ git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@886214 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/server/util_mutex.c b/server/util_mutex.c
@@ -171,7 +171,6 @@ AP_DECLARE_NONSTD(const char *)ap_set_mutex(cmd_parms *cmd, void *dummy,
     apr_pool_t *p = cmd->pool;
     const char **elt;
     const char *mechdir;
-    const char *type;
     int no_mutex = 0, omit_pid = 0;
     apr_array_header_t *type_list;
     apr_lockmech_e mech;
@@ -185,7 +184,7 @@ AP_DECLARE_NONSTD(const char *)ap_set_mutex(cmd_parms *cmd, void *dummy,
     }
 
     mechdir = ap_getword_conf(cmd->pool, &arg);
-    if (*mechdir == NULL) {
+    if (*mechdir == '\0') {
         return "Mutex requires at least a mechanism argument (" 
                AP_ALL_AVAILABLE_MUTEXES_STRING ")";
     }
