quota: fix coredump if projid file does not exist

if '/etc/projid' dose not exist,@project_file will
be NULL pointer, fclose will cause coredump, add
check in endprent().

Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 4 insertions, 2 deletions

diff --git a/quotasys.c b/quotasys.c
index c78e02c..d04f25a 100644
--- a/quotasys.c
+++ b/quotasys.c
@@ -98,8 +98,10 @@ void setprent(void)
 /* Close /etc/projid file */
 void endprent(void)
 {
-	fclose(project_file);
-	project_file = NULL;
+	if (project_file) {
+		fclose(project_file);
+		project_file = NULL;
+	}
 }
 
 /* Get next entry in /etc/projid */