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devfs: fix cclose() crash in devfs error handling

--- a/sys/src/9/port/devfs.c

+++ b/sys/src/9/port/devfs.c

@@ -646,7 +646,7 @@

 Fail:

 		for(i = 1; i < cb->nf; i++)

 			if(idev != nil && idev[i-1] != nil)

-				cclose(idev[i]);

+				cclose(idev[i-1]);

 		if(mp != nil)

 			mdeldev(mp);

 		free(idev);