staging: rtl8821ae: Fix unnecessary whitespace before a quoted newline

Fix checkpatch.pl issues with unnecessary whitespace before a quoted
newline in base.c

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>