ALSA: usb-audio: Minor code cleanup in create_fixed_stream_quirk()

Just a minor code cleanup: unify the error paths.

Change-Id: I2fe930c5d29c88285131f211b2f8e1ecfacd5205
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Git-commit: 902eb7fd1e4af3ac69b9b30f8373f118c92b9729
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>