Fix compiler warning

This commit was SVN r14605.

orte/mca/pls/tm/pls_tm_module.c

@@ -127,7 +127,7 @@ static int pls_tm_launch_job(orte_jobid_t jobid)
     int node_name_index;
     int proc_name_index;
     char *jobid_string;
-    char *uri, *param;
+    char *param;
     char **env = NULL;
     char *var;
     char **argv = NULL;