Staging: bcm: Fix memory leak reported during compile.

This patch fixes a potential memory leak were temp_buff buffer
is not being freed when a certain condition is true.

Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>