perf tools: remove redundant checks from _sort__sym_cmp

We already check that sym_l and sum_r are non-NULLs, no need to do it
twice.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1356030701-16284-12-git-send-email-sasha.levin@oracle.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/sort.c

@@ -143,10 +143,8 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r,
 	if (sym_l == sym_r)
 		return 0;
 
-	if (sym_l)
-		ip_l = sym_l->start;
-	if (sym_r)
-		ip_r = sym_r->start;
+	ip_l = sym_l->start;
+	ip_r = sym_r->start;
 
 	return (int64_t)(ip_r - ip_l);
 }