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nusb/disk: always allow raw scsi request (even without media present)

--- a/sys/src/cmd/nusb/disk/disk.c

+++ b/sys/src/cmd/nusb/disk/disk.c

@@ -746,10 +746,6 @@

 	qlock(lun);

 	switch(path){

 	case Qraw:

-		if(lun->lbsize <= 0 && umscapacity(lun) < 0){

-			respond(req, "phase error");

-			break;

-		}

 		switch(lun->phase){

 		case Pcmd:

 			respond(req, "phase error");

@@ -853,10 +849,6 @@

 		free(s);

 		break;

 	case Qraw:

-		if(lun->lbsize <= 0 && umscapacity(lun) < 0){

-			respond(req, "phase error");

-			break;

-		}

 		switch(lun->phase){

 		case Pcmd:

 			if(count != 6 && count != 10 && count != 12 && count != 16){