shared/util: Fix glob_extend() argument

glob_extend() would completely fail to work, or return incorrect
data if it wasn't being passed the current getopt "optarg" variable
as it used the global variable, instead of the passed parameters.

src/shared/util.c

@@ -4461,7 +4461,7 @@ int glob_extend(char ***strv, const char *path) {
         char **p;
 
         errno = 0;
-        k = glob(optarg, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
+        k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
 
         if (k == GLOB_NOMATCH)
                 return -ENOENT;