Pass current remote name into git_remote_rename

Author: jspahrsummers

ObjectiveGit/GTRemote.m

@@ -156,7 +156,7 @@ - (BOOL)rename:(NSString *)name error:(NSError **)error {
 
 	git_strarray problematic_refspecs;
 
-	int gitError = git_remote_rename(&problematic_refspecs, self.git_remote, name.UTF8String);
+	int gitError = git_remote_rename(&problematic_refspecs, self.repository.git_repository, git_remote_name(self.git_remote), name.UTF8String);
 	if (gitError != GIT_OK) {
 		NSArray *problematicRefspecs = [NSArray git_arrayWithStrarray:problematic_refspecs];
 		NSDictionary *userInfo = [NSDictionary dictionaryWithObject:problematicRefspecs forKey:GTRemoteRenameProblematicRefSpecs];