net: chelsio: cxgb4: add an error code check in t4_load_phy_fw

[ Upstream commit 9f771493da935299c6393ad3563b581255d01a37 ]

t4_set_params_timeout() can return -EINVAL if failed, add check
for this.

Signed-off-by: Su Hui <suhui@nfschina.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>