mandoc: Invalidate the tag_files.tfd after fclose(3)ing the stram

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
Invalidate the tag_files.tfd after fclose(3)ing the stram associated
with it.  In main() assert that the tfd was actually invalidated.
This avoids closing an invalid fd.
From tb@; OK deraadt@ on an earlier version.

Modified Files:
--------------
    mandoc:
        main.c
        tag.c

Revision Data
-------------
Index: tag.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/tag.c,v
retrieving revision 1.18
retrieving revision 1.19
diff -Ltag.c -Ltag.c -u -p -r1.18 -r1.19
--- tag.c
+++ tag.c
@@ -213,6 +213,9 @@ tag_write(void)
 	ohash_delete(&tag_data);
 	if (stream != NULL)
 		fclose(stream);
+	else
+		close(tag_files.tfd);
+	tag_files.tfd = -1;
 }
 
 void
Index: main.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/main.c,v
retrieving revision 1.302
retrieving revision 1.303
diff -Lmain.c -Lmain.c -u -p -r1.302 -r1.303
--- main.c
+++ main.c
@@ -1184,7 +1184,7 @@ spawn_pager(struct tag_files *tag_files)
 	if (dup2(tag_files->ofd, STDOUT_FILENO) == -1)
 		err((int)MANDOCLEVEL_SYSERR, "pager stdout");
 	close(tag_files->ofd);
-	close(tag_files->tfd);
+	assert(tag_files->tfd == -1);
 
 	/* Do not start the pager before controlling the terminal. */
 
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