Staging: bcm: Remove assignment from if conditions reported by checkpatch.pl

This patch removes an assignment from three if
conditions.  In all three cases, the line of code was
attempting to allocate memory, and check
if the memory was allocated in the if statement.
This issue was reported by checkpatch.pl.

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