When reporting that a line is too long, include the line number in the

error message.  While I'm here, add a note that the "line too long"
message isn't always accurate.

PR:		35395
Submitted by:	andrew@ugh.net.au

usr.sbin/pwd_mkdb/pwd_mkdb.c

@@ -505,7 +505,11 @@ scan(fp, pw)
 	 *	-- The Who
 	 */
 	if (!(p = strchr(line, '\n'))) {
-		warnx("line too long");
+		/*
+		 * XXX: This may also happen if the last line in a
+		 * file does not have a trailing newline.
+		 */
+		warnx("line #%d too long", lcnt);
 		goto fmt;
 
 	}