iio: adc: xilinx-ams: fix devm_krealloc() return value check

iio: adc: xilinx-ams: fix devm_krealloc() return value check

commit 6794ed0cfcc6ce737240eccc48b3e8190df36703 upstream.

The clang-analyzer reported a warning: "Value stored to 'ret'
is never read".

Fix the return value check if devm_krealloc() fails to resize
ams_channels.

Fixes: 2abafc0ce6f6 ("iio: adc: Add Xilinx AMS driver")
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20221125113112.219290-1-marpagan@redhat.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>