staging: sm750fb: Change 'x != NULL' to 'x'

Changes the explicit comparison to NULL from 'x != NULL' to 'x'. Issue detected
by checkpatch.

Signed-off-by: Rehas Sachdeva <aquannie@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed