perf top browser: Fix up line width calculation

Fixing an artifact where the last 3 chars of a long DSO name would
remain on the screen sometimes.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-dkiakcl3z69dh1bt9uegaktv@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/ui/browsers/top.c

@@ -43,10 +43,10 @@ static void perf_top_browser__write(struct ui_browser *browser, void *entry, int
 
 	if (top->evlist->nr_entries == 1 || !top->display_weighted) {
 		slsmg_printf("%20.2f ", syme->weight);
-		width -= 24;
+		width -= 21;
 	} else {
 		slsmg_printf("%9.1f %10ld ", syme->weight, syme->snap_count);
-		width -= 23;
+		width -= 20;
 	}
 
 	slsmg_printf("%4.1f%%", pcnt);