staging: sm750fb: line over 80 characters

Convert a single line comment to a multiline comment to respect the 80
character rule.Problem found using checkpatch.

Signed-off-by: Gokce Kuler <gokcekuler@gmail.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Link: https://lore.kernel.org/r/20200328201513.GA16863@siyah2


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>