Coverity CID 2969: Check for negative stack in the 'P' case like we do in
the 0 case.
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@ -1,4 +1,4 @@
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/* $NetBSD: checknr.c,v 1.18 2006/04/02 03:29:17 christos Exp $ */
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/* $NetBSD: checknr.c,v 1.19 2006/04/25 19:25:19 christos Exp $ */
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/*
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* Copyright (c) 1980, 1993
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@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
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#if 0
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static char sccsid[] = "@(#)checknr.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: checknr.c,v 1.18 2006/04/02 03:29:17 christos Exp $");
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__RCSID("$NetBSD: checknr.c,v 1.19 2006/04/25 19:25:19 christos Exp $");
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#endif
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#endif /* not lint */
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@ -381,7 +381,8 @@ process(FILE *f)
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} else if (!fflag && line[i]=='f') {
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n = line[++i];
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if (n == 'P') {
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if (stk[stktop].opno == FT) {
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if (stktop >= 0 &&
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stk[stktop].opno == FT) {
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stktop--;
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} else {
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pe(lineno);
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