ext/intl: Fix grapheme_extract() next offset

[LamentXU123]

<?php
var_dump(grapheme_extract("\u{00E9}x", 1, GRAPHEME_EXTR_COUNT, 1, $next));
var_dump($next);

string(1) "x"
int(2)

Next should be 3 instead.

[devnexen]

nit: your solution looks fine but would this work ?

--- a/ext/intl/grapheme/grapheme_string.c
+++ b/ext/intl/grapheme/grapheme_string.c
@@ -785,7 +785,8 @@ PHP_FUNCTION(grapheme_extract)
              }
      }

-     str_len -= (pstr - str);
+     lstart = pstr - str;
+     str_len -= lstart;

      /* if the string is all ASCII up to size+1 - or str_len whichever is first - then we are done.
              (size + 1 because the size-th character might be the beginning of a grapheme cluster)
@@ -794,7 +795,7 @@ PHP_FUNCTION(grapheme_extract)
      if ( -1 != grapheme_ascii_check((unsigned char *)pstr, MIN(size + 1, str_len)) ) {
              size_t nsize = MIN(size, str_len);
              if ( NULL != next ) {
-                     ZEND_TRY_ASSIGN_REF_LONG(next, start + nsize);
+                     ZEND_TRY_ASSIGN_REF_LONG(next, lstart + nsize);
              }
              RETURN_STRINGL(pstr, nsize);
      }
@@ -828,7 +829,7 @@ PHP_FUNCTION(grapheme_extract)
      ubrk_close(bi);

      if ( NULL != next ) {
-             ZEND_TRY_ASSIGN_REF_LONG(next, start + ret_pos);
+             ZEND_TRY_ASSIGN_REF_LONG(next, lstart + ret_pos);
      }

      RETURN_STRINGL(((char *)pstr), ret_pos);

[LamentXU123]

Yes indeed :)