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in: report when neatroff cannot open a file

Reported by Blake McBride <[email protected]>.

--- a/in.c

+++ b/in.c

@@ -46,13 +46,15 @@

 void in_so(char *path)

 {

 	FILE *fin = path && path[0] ? fopen(path, "r") : stdin;

-	if (fin) {

-		in_new();

-		buf->fin = fin;

-		buf->lnum = 1;

-		if (path)

-			snprintf(buf->path, sizeof(buf->path), "%s", path);

+	if (!fin) {

+		errmsg("neatroff: failed to open <%s>\n", path);

+		return;

 	}

+	in_new();

+	buf->fin = fin;

+	buf->lnum = 1;

+	if (path)

+		snprintf(buf->path, sizeof(buf->path), "%s", path);

 }

 void in_lf(char *path, int lnum)