USB: TI 3410/5052 USB Serial Driver: Fix mem leak when firmware is too big.

If the size of the firmware exceeds TI_FIRMWARE_BUF_SIZE we'll leak 'fw_p'
by failing to call release_firmware().
This patch fixes the leak.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>