sata_sx4: correctly handling failed allocation

Since kzalloc can be failed in memory pressure, return error when failed.

Signed-off-by: Insu Yun <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

drivers/ata/sata_sx4.c

···
 		addr = 0;
 		length = size * 1024 * 1024;
 		buf = kzalloc(ECC_ERASE_BUF_SZ, GFP_KERNEL);
+		if (!buf)
+			return 1;
 		while (addr < length) {
 			pdc20621_put_to_dimm(host, buf, addr,
 					     ECC_ERASE_BUF_SZ);