fwk: fix printing on error in Framework bind function

The fwk_module_bind function is currently asserting before printing
the error message. This patch corrects the order so that the error
message is printed first.

Signed-off-by: Leandro Belli <leandro.belli@arm.com>
Change-Id: Id72170768aa5a79bbfc35f26d23a3939feb4931c