perf evlist: Explicititely initialize input_name

It was a global variable, so it was initialized, implicitely, to zero by
being placed in the bss.

Now it is just a local variable that is then passed to the __cmd_evlist
routine, so it must be explicitely set to NULL.

The problem manifested on a Fedora 17 system, using:

 gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC)

But not on several other systems, by luck.

Reported-by: Ingo Molnar <mingo@kernel.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-5e8wolcjs3rgd5i6yi995gfh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index e52d77ec7084..acd78dc28341 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -116,7 +116,7 @@ static const char * const evlist_usage[] = {
 int cmd_evlist(int argc, const char **argv, const char *prefix __used)
 {
         struct perf_attr_details details = { .verbose = false, };
-        const char *input_name;
+        const char *input_name = NULL;
         const struct option options[] = {
                 OPT_STRING('i', "input", &input_name, "file",
                             "Input file name"),