fix compiler warning

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@50753 15284696-431f-4ddb-bdfa-cd5b030d7da7

general/g.findfile/element.c

@@ -11,5 +11,5 @@ void list_elements()
 
 int check_element(const char *element)
 {
-    M_read_list(FALSE, NULL);
+    return M_read_list(FALSE, NULL);
 }