xilinx: zynqmp: Check return value from xilinx_pm_request()

xilinx_pm_request() can failed that's why also check return value.

Fixes: 050f10f103cd ("xilinx: zynqmp: remove chip_id function")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
1 file changed