ASoC: dsp: amrwb_in: Fix AUDIO_GET_AMRWB_ENC_CONFIG ioctl

The non-blocking if-statement here causes the AUDIO_GET_AMRWB_ENC_CONFIG
ioctl to always return -EFAULT, even upon success. Fix it by correctly
guarding the -EFAULT return value.

Change-Id: Ia3a7247f5febb21d3b654c0ed29e81135e732c79
Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
[dereference23: Extend to audio-kernel 4.0]
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>