Fix CID-10337 (unreachable code):

* only return the catalog if it isn't NULL, thus allowing the loop 
  to potentially increase the loop var - in turn making code reachable
  that wasn't before


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39942 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/locale/MutableLocaleRoster.cpp

@@ -814,6 +814,7 @@ MutableLocaleRoster::LoadCatalog(const char* signature, const char* language,
 					currCatalog = nextCatalog;
 				}
 			}
+			if (catalog != NULL)
 				return catalog;
 		}
 		info->UnloadIfPossible();