char: xilinx_hwicap: missing error code if ioremap() fails

Return -ENOMEM instead of success if ioremap() fails.

Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Jingoo Han <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/char/xilinx_hwicap/xilinx_hwicap.c

···
 	drvdata->base_address = ioremap(drvdata->mem_start, drvdata->mem_size);
 	if (!drvdata->base_address) {
 		dev_err(dev, "ioremap() failed\n");
+		retval = -ENOMEM;
 		goto failed2;
 	}