Fix legacy conversion filter for HZ

Author: alexdowad

ext/mbstring/libmbfl/filters/mbfilter_hz.c

@@ -130,6 +130,7 @@ int mbfl_filt_conv_hz_wchar(int c, mbfl_convert_filter *filter)
 			filter->status = 0x10;
 		} else if (c == '~' && filter->status == 2) {
 			CK((*filter->output_function)('~', filter->data));
+			filter->status -= 2;
 		} else if (c == '\n') {
 			/* "~\n" is a line continuation; no output is needed, nor should we shift modes */
 			filter->status -= 2;

ext/mbstring/tests/hz_encoding.phpt

@@ -33,6 +33,7 @@ testValidString('~~', '~', 'HZ', 'ASCII');
 testValidString("~\n", '', 'HZ', 'ASCII', false);
 testValidString('~{~}', '', 'HZ', 'ASCII', false);
 testValidString("~{~\n~}", '', 'HZ', 'ASCII', false);
+testValidString('~~?', '~?', 'HZ', 'ASCII');
 echo "Tested valid ~ escapes\n";
 
 for ($i = 0; $i < 0xFF; $i++) {