Eliminate the following compiler warning on non-x86 platforms by limiting
the variable scope:

drivers/video/sis/sis_main.c:4108: warning: unused variable 'temp'
Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>