staging: sm750fb: Fix typo in comment

Fixing typo in word 'and'.

Signed-off-by: Gabriela Bittencourt <gabrielabittencourt00@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Link: https://lore.kernel.org/r/20191029232207.4113-2-gabrielabittencourt00@gmail.com


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