scsi: check kmalloc() return value.

index f6caa43..fcd635b 100644
@@ -324,7 +324,7 @@ ch_readconfig(scsi_changer *ch)
 	if (!buffer)
 		return -ENOMEM;
 	memset(buffer,0,512);
-	
+
 	memset(cmd,0,sizeof(cmd));
 	cmd[0] = MODE_SENSE;
 	cmd[1] = ch->device->lun << 5;

@@ -367,7 +367,7 @@ ch_readconfig(scsi_changer *ch)
 	} else {
 		vprintk("reading element address assigment page failed!\n");
 	}
-	
+
 	/* vendor specific element types */
 	for (i = 0; i < 4; i++) {
 		if (0 == vendor_counts[i])

@@ -384,6 +384,10 @@ ch_readconfig(scsi_changer *ch)
 	/* look up the devices of the data transfer elements */
 	ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 			 GFP_KERNEL);
+	if (!ch->dt) {
+		kfree(buffer);
+		return -ENOMEM;
+	}
 	for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 		id  = -1;
 		lun = 0;