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lib9p: fix re-use of root Qid when using createfile(); remove unused dirqidgen

--- a/sys/include/9p.h

+++ b/sys/include/9p.h

@@ -152,7 +152,6 @@

 /* below is implementation-specific; don't use */

 	Lock genlock;

 	ulong qidgen;

-	ulong dirqidgen;

 };

 Tree*	alloctree(char*, char*, ulong, void(*destroy)(File*));

--- a/sys/src/lib9p/file.c

+++ b/sys/src/lib9p/file.c

@@ -337,8 +337,9 @@

 	incref(f);

 	t->root = f;

-	t->qidgen = 0;

-	t->dirqidgen = 1;

+

+	/* t->qidgen starts at 1 because root Qid.path is 0 */

+	t->qidgen = 1;

 	if(destroy == nil)

 		destroy = nop;

 	t->destroy = destroy;