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disk/qcowfs: don't clobber files that exist

set OEXCL in create when passing '-n' to ensure
we don't accidentally overwrite an existing disk
image.

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

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

@@ -581,11 +581,11 @@

 		usage();

 		break;

 	}ARGEND

-	if(argc < 1)

+	if(argc != 1)

 		usage();

 	if(nflag){

-		if((fd = create(argv[0], ORDWR, 0666)) < 0)

+		if((fd = create(argv[0], OEXCL|ORDWR, 0666)) < 0)

 			sysfatal("create: %r");

 		qc2create(fd, size);

 		seek(fd, 0, 0);

-- 

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