Staging: rts5139: fix parantheses coding style issue in ms.c

This patch fixes an unnecessary return statement parantheses error
found in ms.c by the checkpatch.pl tool.

Signed-off-by: Preetam D'Souza <preetamjdsouza@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>