chg: silently inherit server exit code

If chgserver aborts during startup, for example, error.ParseError when parsing
a config file, chg client probably just wants to exit with a same exit code
without printing other unrelated text. This patch changes the text "cmdserver
exited with status" from abortmsg to debugmsg and exits with a same exit code.

contrib/chg/chg.c

@@ -252,7 +252,8 b' static hgclient_t *retryconnectcmdserver'
 
 cleanup:
 	if (WIFEXITED(pst)) {
-		abortmsg("cmdserver exited with status %d", WEXITSTATUS(pst));
+		debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst));
+		exit(WEXITSTATUS(pst));
 	} else if (WIFSIGNALED(pst)) {
 		abortmsg("cmdserver killed by signal %d", WTERMSIG(pst));
 	} else {