SATA: check for return value from sata functions

sata functions are called even if previous functions failed
because return value is not checked.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Dirk Behme <dirk.behme@de.bosch.com>
CC: Fabio Estevam <fabio.estevam@freescale.com>

common/cmd_sata.c

@@ -48,9 +48,12 @@ int __sata_initialize(void)
 		sata_dev_desc[i].block_write = sata_write;
 
 		rc = init_sata(i);
-		rc = scan_sata(i);
-		if ((sata_dev_desc[i].lba > 0) && (sata_dev_desc[i].blksz > 0))
-			init_part(&sata_dev_desc[i]);
+		if (!rc) {
+			rc = scan_sata(i);
+			if (!rc && (sata_dev_desc[i].lba > 0) &&
+				(sata_dev_desc[i].blksz > 0))
+				init_part(&sata_dev_desc[i]);
+		}
 	}
 	sata_curr_device = 0;
 	return rc;