Add a missing OMPI_THREAD_UNLOCK. Doh!

This commit was SVN r3799.

src/mca/io/base/io_base_component_list.c

@@ -104,6 +104,7 @@ int mca_io_base_component_add(mca_io_base_components_t *comp)
         }
         ompi_list_append(&components_in_use, (ompi_list_item_t *) citem);
     }
+
     OMPI_THREAD_UNLOCK(&mutex);
 
     /* All done */
@@ -148,6 +149,8 @@ int mca_io_base_component_del(mca_io_base_components_t *comp)
         }
     }
 
+    OMPI_THREAD_UNLOCK(&mutex);
+
     /* All done */
 
     return OMPI_SUCCESS;