Fix build with clang

src/acl.c

@@ -53,16 +53,18 @@ static int
 run_cmd(const char *cmdstring)
 {
     pid_t pid;
-    int status;
-    if (cmdstring == NULL) {
-        return 1;
-    }
+    int status = 0;
+
+    if (cmdstring == NULL)
+        return -1;
+
     if ((pid = fork()) < 0) {
         status = -1;
     } else if (pid == 0) {
         execl("/bin/sh", "sh", "-c", cmdstring, (char *)0);
         _exit(127);
     }
+
     return status;
 }