mali-driver: change the WARN info [1/1]

PD#SWPL-42494

Problem:
two may debug info result in crash reboot

Solution:
change the WARN_ON TO WARN_ONCE

Verify:
ah212

Change-Id: Ie5941ab1465f1196efb128295b5a6a90b6f423e8
Signed-off-by: Dezhi Kong <dezhi.kong@amlogic.com>
1 file changed