Staging: bcm: Remove assignment in if condition reported by checkpatch.pl

There is a case where an assignment was being done
in an if condition. This patch removes the assignment
from the if condition and places the assignment above
the if statement; thereby improving the readability of
the code.

Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>