perf top: Add missing newline if the 'uid' is invalid

Add missing newline if the 'uid' is invalid:

  hubble:~> perf top --stdio -u help
  Error:
  Invalid User: helphubble:~>

Fixed by this patch:

  comet:~/tip/tools/perf> perf top --stdio -u help
  Error:
  Invalid User: help
  comet:~/tip/tools/perf>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20131112232609.GA31474@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-top.c

@@ -1172,7 +1172,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	status = target__validate(target);
 	if (status) {
 		target__strerror(target, status, errbuf, BUFSIZ);
-		ui__warning("%s", errbuf);
+		ui__warning("%s\n", errbuf);
 	}
 
 	status = target__parse_uid(target);
@@ -1180,7 +1180,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 		int saved_errno = errno;
 
 		target__strerror(target, status, errbuf, BUFSIZ);
-		ui__error("%s", errbuf);
+		ui__error("%s\n", errbuf);
 
 		status = -saved_errno;
 		goto out_delete_evlist;