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>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7b24cf3237d8..f6081cb3fca3 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;
 }