[PATCH] pid: fix uninitialized var warnings

[Walter Wu]

Compiling with gcc-9.2.1 points out below warnings. Fix it.

kernel/pid.c: In function 'alloc_pid':
kernel/pid.c:180:10: warning: 'retval' may be used uninitialized
in this function [-Wmaybe-uninitialized]

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Christian Brauner <christian@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
---
 kernel/pid.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index ff6cd6786d10..02944cfd4e51 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -176,8 +176,10 @@ struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid,
 		return ERR_PTR(-EINVAL);
 
 	pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL);
-	if (!pid)
+	if (!pid) {
+		retval = -ENOMEM;
 		return ERR_PTR(retval);
+	}
 
 	tmp = ns;
 	pid->level = ns->level;
-- 
2.18.0