staging: rts5139: Fix quoted string split across lines

This patch fixes the quoted string split across
lines in staging/rts5139/ms.c

Signed-off-by: Georgiana Rodica Chelu <georgiana.chelu93@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>