Staging: media: Replace dev_err with pr_err to avoid null pointer derefrence

This patch replace dev_err with pr_err, for pointer is derefrenced after comparing it to NULL.
This was found using the following coccinelle script:

@disable is_null@
identifier f;
expression E;
identifier fld;
statement S;
@@

+ if(E == NULL) S
f(...,E->fld,...);
-if(E == NULL) S;

@@
identifier f;
expression E;
identifier fld;
statement S;
@@

+ if(!E) S
f(...,E->fld,...);
-if(!E) S;

Signed-off-by: Haneen Mohammed <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/media/lirc/lirc_zilog.c

···
 	struct IR *ir = filep->private_data;
 
 	if (ir == NULL) {
-		dev_err(ir->l.dev,
-			"close: no private_data attached to the file!\n");
+		pr_err("ir: close: no private_data attached to the file!\n");
 		return -ENODEV;
 	}