osc/rdma: fix CID 1424327

Fix minor memory leak.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

ompi/mca/osc/rdma/osc_rdma_component.c

@@ -17,6 +17,7 @@
  * Copyright (c) 2015      NVIDIA Corporation.  All rights reserved.
  * Copyright (c) 2015-2017 Intel, Inc. All rights reserved.
  * Copyright (c) 2016-2017 IBM Corporation. All rights reserved.
+ * Copyright (c) 2018      Cisco Systems, Inc.  All rights reserved
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -775,10 +776,12 @@ static int ompi_osc_rdma_query_mtls (void)
     if (mtls_to_use && ompi_mtl_base_selected_component) {
 	for (int i = 0 ; mtls_to_use[i] ; ++i) {
 	    if (0 == strcmp (mtls_to_use[i], ompi_mtl_base_selected_component->mtl_version.mca_component_name)) {
+                opal_argv_free(mtls_to_use);
 		return OMPI_SUCCESS;
 	    }
 	}
     }
+    opal_argv_free(mtls_to_use);
     return -1;
 }