arch/microblaze/boot/dts: Update microblaze dts FMCDAQ2 FMCADC2 FMCADC5

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
drivers/iio/adc/cf_axi_adc_core: axiadc_probe() fix error handling

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
drivers/iio/adc/cf_axi_adc_ring_stream: Fix error handling

iio_dmaengine_buffer_alloc() may return ERR_PTR other than NULL


Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
arch/microblaze/boot/dts: Update and add device trees

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Merge branch 'xcomm_zynq' of https://github.com/analogdevicesinc/linux into xcomm_zynq