perf annotate browser: Add a right arrow before call instructions

The counterpart of 'ret' instructions.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
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-jlz2ldaquaow0rqi2vr4b91l@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/annotate.c

@@ -117,6 +117,9 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 				ui_browser__write_graph(self, fwd ? SLSMG_DARROW_CHAR :
 								    SLSMG_UARROW_CHAR);
 				SLsmg_write_char(' ');
+			} else if (ins__is_call(dl->ins)) {
+				ui_browser__write_graph(self, SLSMG_RARROW_CHAR);
+				SLsmg_write_char(' ');
 			} else {
 				slsmg_write_nstring(" ", 2);
 			}