code: plan9front

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devproc: make sure statbufread offset wont turn negative

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

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

@@ -995,7 +995,7 @@

 		qunlock(&p->debug);

 		poperror();

-		if(i <= 0)

+		if(i <= 0 || i > j)

 			return 0;

 		if(i < n)

 			n = i;