[tip:perf/core] perf tools: Allow passing NULL to intlist__find

[tip:perf/core] perf tools: Allow passing NULL to intlist__find

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  5a3d04d6dc9050b4b4562f5c66aea23f0aa1c003
Gitweb:     http://git.kernel.org/tip/5a3d04d6dc9050b4b4562f5c66aea23f0aa1c003
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Thu, 24 Jan 2013 16:10:42 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 24 Jan 2013 16:40:53 -0300

perf tools: Allow passing NULL to intlist__find

So that we can work with optional parameters that may not set up an
intlist.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.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-e9tmvgdzehqrza11zs0nbg7g@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/intlist.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/intlist.c b/tools/perf/util/intlist.c
index 9d07400..cbf0c32 100644
--- a/tools/perf/util/intlist.c
+++ b/tools/perf/util/intlist.c
@@ -59,9 +59,14 @@ void intlist__remove(struct intlist *ilist, struct int_node *node)
 
 struct int_node *intlist__find(struct intlist *ilist, int i)
 {
-	struct int_node *node = NULL;
-	struct rb_node *rb_node = rblist__find(&ilist->rblist, (void *)((long)i));
+	struct int_node *node;
+	struct rb_node *rb_node;
+
+	if (ilist == NULL)
+		return NULL;
 
+	node = NULL;
+	rb_node = rblist__find(&ilist->rblist, (void *)((long)i));
 	if (rb_node)
 		node = container_of(rb_node, struct int_node, rb_node);