printk: fix failure to return error in devkmsg_poll()

Error value got overwritten instantly.

Signed-off-by: Nicolas Kaiser <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed