Description:
------------
gmp_hamdist() continuously produces a crash:

if (ZEND_NUM_ARGS() != 2 || zend_get_parameters_ex(1, &a_arg, &b_arg) == FAILURE){

1 should be 2, b_arg is not being set properly, and thus FETCH_GMP_ZVAL(gmpnum_b, b_arg); is crashing.

Reproduce code:
---------------
<?php
    gmp_hamdist("1", "2");
?>

Actual result:
--------------
#0  0x0807c987 in zif_gmp_hamdist (ht=2, return_value=0x81c3994, this_ptr=0x0, return_value_used=1)
    at /usr/home/dave/php-5.0.0b3/ext/gmp/gmp.c:1239
1239            FETCH_GMP_ZVAL(gmpnum_b, b_arg);
(gdb) bt
#0  0x0807c987 in zif_gmp_hamdist (ht=2, return_value=0x81c3994, this_ptr=0x0, return_value_used=1)
    at /usr/home/dave/php-5.0.0b3/ext/gmp/gmp.c:1239
#1  0x0815e6ee in zend_do_fcall_common_helper (execute_data=0xbfbfe000, op_array=0x81c2134)
    at /usr/home/dave/php-5.0.0b3/Zend/zend_execute.c:2535
#2  0x0815bcef in execute (op_array=0x81c2134) at /usr/home/dave/php-5.0.0b3/Zend/zend_execute.c:1260
#3  0x08145be7 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/home/dave/php-5.0.0b3/Zend/zend.c:1048
#4  0x0811bf17 in php_execute_script (primary_file=0xbfbff6e8) at /usr/home/dave/php-5.0.0b3/main/main.c:1638
#5  0x08164a1d in main (argc=2, argv=0xbfbff748) at /usr/home/dave/php-5.0.0b3/sapi/cli/php_cli.c:910
#6  0x0806d4a5 in _start ()
(gdb) print gmpnum_b
$1 = (struct {...} (*)[1]) 0xc
(gdb) print b_arg
$2 = (struct _zval_struct **) 0xb4
(gdb) print *b_arg
Cannot access memory at address 0xb4
(gdb) print *gmpnum_b
Cannot access memory at address 0xc