lockdown: initialize local array before use to quiet static analysis

The static code analysis tool "Coverity Scan" pointed the following
details out for further development considerations:

  CID 1486102: Uninitialized scalar variable (UNINIT)
  uninit_use_in_call: Using uninitialized value *temp when calling
                      strlen.

Signed-off-by: Tanya Agarwal <tanyaagarwal25699@gmail.com>
[PM: edit/reformat the description, subject line]
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/lockdown/lockdown.c

@@ -96,7 +96,7 @@ static int __init lockdown_lsm_init(void)
 static ssize_t lockdown_read(struct file *filp, char __user *buf, size_t count,
 			     loff_t *ppos)
 {
-	char temp[80];
+	char temp[80] = "";
 	int i, offset = 0;
 
 	for (i = 0; i < ARRAY_SIZE(lockdown_levels); i++) {