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sam: fix spurious overwrite message (patch from plan9port)

Fixes:

% sam -d
 -.
w /tmp/foo
/tmp/foo: (new file) #0
w /tmp/foo
?warning: write might change good version of `/tmp/foo'

--- a/sys/src/cmd/sam/io.c

+++ b/sys/src/cmd/sam/io.c

@@ -66,7 +66,7 @@

 		warn(Wnotnewline);

 	closeio(n);

 	if(f->name.s[0]==0 || samename){

-		if(statfile(name, &dev, &qid, &mtime, 0, 0) > 0){

+		if(statfile(genc, &dev, &qid, &mtime, 0, 0) > 0){

 			f->dev = dev;

 			f->qidpath = qid;

 			f->mtime = mtime;