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devproc: fix mistake

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

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

@@ -1614,12 +1614,14 @@

 		poperror();

 		poperror();

 		/* segment s still locked, fixfault() unlocks */

-		if(!waserror()){

-			if(fixfault(s, offset, read, 0) == 0)

-				break;

-			poperror();

+		if(waserror()){

+			putseg(s);

+			nexterror();

 		}

+		if(fixfault(s, offset, read, 0) == 0)

+			break;

 		putseg(s);

+		poperror();

 	}

 	/*