[tip:perf/core] perf header: Fix double fclose() on do_write(fd, xxx) failure

[tip-bot for Thomas Jarosch <thomas.jarosch@intra2net.com>]

Commit-ID:  5809fde040de2afa477a6c593ce2e8fd2c11d9d3
Gitweb:     http://git.kernel.org/tip/5809fde040de2afa477a6c593ce2e8fd2c11d9d3
Author:     Thomas Jarosch <thomas.jarosch@intra2net.com>
AuthorDate: Mon, 28 Jan 2013 10:21:14 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 30 Jan 2013 10:40:44 -0300

perf header: Fix double fclose() on do_write(fd, xxx) failure

cppcheck reported:
[util/header.c:983]: (error) Used file that is not opened.

Thanks to Arnaldo Carvalho de Melo for pointing out that
fclose(NULL) is undefined behavior -> protect against it.

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Link: http://lkml.kernel.org/r/1751778.SZQB4fNdIh@storm
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7b24cf3..f6081cb 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -955,6 +955,7 @@ static int write_topo_node(int fd, int node)
 	}
 
 	fclose(fp);
+	fp = NULL;
 
 	ret = do_write(fd, &mem_total, sizeof(u64));
 	if (ret)
@@ -981,7 +982,8 @@ static int write_topo_node(int fd, int node)
 	ret = do_write_string(fd, buf);
 done:
 	free(buf);
-	fclose(fp);
+	if (fp)
+		fclose(fp);
 	return ret;
 }