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tftpfs: make sure path is null terminated

--- a/sys/src/cmd/ip/tftpfs.c

+++ b/sys/src/cmd/ip/tftpfs.c

@@ -53,7 +53,7 @@

 	f = emalloc9p(sizeof *f);

 	memset(f, 0, sizeof(*f));

 	ipmove(f->addr, addr);

-	strncpy(f->path, path, sizeof(f->path));

+	strncpy(f->path, path, Maxpath-1);

 	f->ref = 1;

 	f->id = id++;

 	f->next = files;