sed: fix /regex/,+N match triggering only once, closes 11871

function                                             old     new   delta
process_files                                       2235    2246     +11

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

editors/sed.c

@@ -1097,6 +1097,8 @@ static void process_files(void)
 		int old_matched, matched;
 
 		old_matched = sed_cmd->in_match;
+		if (!old_matched)
+			sed_cmd->end_line = sed_cmd->end_line_orig;
 
 		/* Determine if this command matches this line: */