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devproc: fix syscalltrace read for ratrace

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

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

@@ -1119,9 +1119,10 @@

 		goto statbufread;

 	case Qsyscall:

-		n = 0;

 		if(p->syscalltrace != nil)

 			n = readstr(offset, va, n, p->syscalltrace);

+		else

+			n = 0;

 		break;

 	case Qnote: