firmware: xilinx: check return value of zynqmp_pm_get_api_version()

Currently return value of zynqmp_pm_get_api_version() is ignored.
Because of that, API version is checked in case of error also.
So add check for return value of zynqmp_pm_get_api_version().

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/1633509835-31949-1-git-send-email-rajan.vaja@xilinx.com
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/firmware/xilinx/zynqmp.c

@@ -1434,7 +1434,10 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
 		return ret;
 
 	/* Check PM API version number */
-	zynqmp_pm_get_api_version(&pm_api_version);
+	ret = zynqmp_pm_get_api_version(&pm_api_version);
+	if (ret)
+		return ret;
+
 	if (pm_api_version < ZYNQMP_PM_VERSION) {
 		panic("%s Platform Management API version error. Expected: v%d.%d - Found: v%d.%d\n",
 		      __func__,