perf hists: Fix period symbol_conf.field_sep display

Currently we don't properly display hist data with symbol_conf.field_sep
separator. We need to display either space or separator.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/tip-cyggwys0bz5kqdowwvfd8h72@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/hist.c

@@ -472,11 +472,15 @@ int hist_entry__period_snprintf(struct perf_hpp *hpp, struct hist_entry *he,
 		return 0;
 
 	perf_hpp__for_each_format(fmt) {
+		/*
+		 * If there's no field_sep, we still need
+		 * to display initial '  '.
+		 */
 		if (!sep || !first) {
 			ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
 			advance_hpp(hpp, ret);
+		} else
 			first = false;
-		}
 
 		if (color && fmt->color)
 			ret = fmt->color(hpp, he);