btl/tcp: fix misc memory leaks

as reported by Coverity with CIDs 710615, 710616 and 710618

opal/mca/btl/tcp/btl_tcp_component.c

@@ -532,9 +532,9 @@ static int mca_btl_tcp_component_create_instances(void)
     const int if_count = opal_ifcount();
     int if_index;
     int kif_count = 0;
-    int *kindexes = NULL; /* this array is way too large, but never too small */
-    char **include;
-    char **exclude;
+    int *kindexes; /* this array is way too large, but never too small */
+    char **include = NULL;
+    char **exclude = NULL;
     char **argv;
     int ret = OPAL_SUCCESS;
 
@@ -601,7 +601,6 @@ static int mca_btl_tcp_component_create_instances(void)
         mca_btl_tcp_create(if_index, if_name);
         argv++;
     }
-    opal_argv_free(include);
 
     /* If we made any modules, then the "include" list was non-empty,
        and therefore we're done. */
@@ -640,6 +639,12 @@ static int mca_btl_tcp_component_create_instances(void)
     opal_argv_free(exclude);
 
  cleanup:
+    if (NULL != include) {
+        opal_argv_free(include);
+    }
+    if (NULL != exclude) {
+        opal_argv_free(exclude);
+    }
     if (NULL != kindexes) {
         free(kindexes);
     }

opal/mca/btl/tcp/btl_tcp_proc.c

@@ -12,7 +12,7 @@
  *                         All rights reserved.
  * Copyright (c) 2008-2010 Oracle and/or its affiliates.  All rights reserved
  * Copyright (c) 2013-2014 Intel, Inc. All rights reserved
- * Copyright (c) 2014      Research Organization for Information Science
+ * Copyright (c) 2014-2015 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
  * $COPYRIGHT$
  * 
@@ -328,7 +328,7 @@ static mca_btl_tcp_interface_t** mca_btl_tcp_retrieve_local_interfaces(void)
                 local_interfaces = (mca_btl_tcp_interface_t**)realloc( local_interfaces,
                                                                        max_local_interfaces * sizeof(mca_btl_tcp_interface_t*) );
                 if( NULL == local_interfaces )
-                    return NULL;
+                    goto cleanup;
             }
             local_interfaces[index] = (mca_btl_tcp_interface_t *) malloc(sizeof(mca_btl_tcp_interface_t));
             assert(NULL != local_interfaces[index]);
@@ -369,8 +369,13 @@ static mca_btl_tcp_interface_t** mca_btl_tcp_retrieve_local_interfaces(void)
                         local_addr.ss_family);
         }
     }
-    opal_argv_free(include);
-    opal_argv_free(exclude);
+cleanup:
+    if (NULL != include) {
+        opal_argv_free(include);
+    }
+    if (NULL != exclude) {
+        opal_argv_free(exclude);
+    }
 
     return local_interfaces;
 }