two bug fixed: return value of mb_strimwidth() was invalid and separator parameter of mb_parse_str wasn't worked.

ext/mbstring/mbfilter.c

@@ -6974,6 +6974,9 @@ mbfl_strimwidth(
 				}
 				mbfl_convert_filter_flush(encoder);
 			}
+		} else if (pc.status != 0) {
+			pc.device.pos = pc.endpos;
+			mbfl_convert_filter_copy(pc.decoder_backup, pc.decoder);
 		}
 		mbfl_convert_filter_flush(pc.decoder);
 	}

ext/mbstring/mbstring.c

@@ -1164,7 +1164,7 @@ PHP_FUNCTION(mb_parse_str)
 			len_list[n] = 0;
 		}
 		n++;
-		var = php_strtok_r(NULL, "&", &strtok_buf);
+		var = php_strtok_r(NULL, separator, &strtok_buf);
 	}
 	num = n;