Description:
------------
When calling SphinxClient with a string causing a negation 
error (e.g not escaping it well) a segmentation fault happens.

An example of a query which generates this code:

[root@my_server]# ./search -i index_name -e 'bla - ( x /- y )'
Sphinx 0.9.8.1-release (r1533)
Copyright (c) 2001-2008, Andrew Aksyonoff

using config file '/usr/local/sphinx-
0.9.8.1/etc/sphinx.conf'...
index 'index_name': search error: query error: negation is 
only allowed at top level.

Expected result:
----------------
Handling the error result object without a segmentation fault

Actual result:
--------------
GDB Backtrace:

#0  0x0000002a971017ee in php_sphinx_result_to_array 
(c=0x2aa28bfde0, result=0x9b7c40, array=0x7fbfffccf8)
    at /usr/local/src/sphinx-1.0.3/sphinx.c:189
        tmp = Variable "tmp" is not available.
(gdb) bt
#0  0x0000002a971017ee in php_sphinx_result_to_array 
(c=0x2aa28bfde0, result=0x9b7c40, array=0x7fbfffccf8)
    at /usr/local/src/sphinx-1.0.3/sphinx.c:189
#1  0x0000002a97104b31 in zim_SphinxClient_runQueries 
(ht=Variable "ht" is not available.
) at /usr/local/src/sphinx-1.0.3/sphinx.c:1344
#2  0x0000002a95e7bf32 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x2a9f469548)
    at /root/php53/php-5.3.0/Zend/zend_vm_execute.h:313
#3  0x0000002a95e7b349 in execute (op_array=0xc692b0) at 
/root/php53/php-5.3.0/Zend/zend_vm_execute.h:104
#4  0x0000002a95e4b8b7 in zend_call_function 
(fci=0x7fbfffd040, fci_cache=Variable "fci_cache" is not 
available.
) at /root/php53/php-5.3.0/Zend/zend_execute_API.c:936
#5  0x0000002a95e6cf39 in zend_call_method 
(object_pp=0x7fbfffd100, obj_ce=0x2a9f819a00, 
fn_proxy=0x2a9f819be0, 
    function_name=0x2a962f5b32 "__call", 
function_name_len=6, retval_ptr_ptr=Variable 
"retval_ptr_ptr" is not available.
) at /root/php53/php-5.3.0/Zend/zend_interfaces.c:97
#6  0x0000002a95e77494 in zend_std_call_user_call 
(ht=Variable "ht" is not available.
) at /root/php53/php-5.3.0/Zend/zend_object_handlers.c:682
#7  0x0000002a95e7bf32 in zend_do_fcall_common_helper_SPEC 
(execute_data=0x2a9f459a98)
    at /root/php53/php-5.3.0/Zend/zend_vm_execute.h:313
#8  0x0000002a95e7b349 in execute (op_array=0x2a9f9a9b28) at 
/root/php53/php-5.3.0/Zend/zend_vm_execute.h:104
#9  0x0000002a95e59815 in zend_execute_scripts (type=8, 
retval=0x0, file_count=3) at /root/php53/php-
5.3.0/Zend/zend.c:1188
#10 0x0000002a95e07b35 in php_execute_script 
(primary_file=0x7fbffff6f0) at /root/php53/php-
5.3.0/main/main.c:2196
#11 0x0000002a95edf9c9 in php_handler (r=0x99b608) at 
/root/php53/php-5.3.0/sapi/apache2handler/sapi_apache2.c:648
#12 0x000000000043cbd3 in ap_run_handler (r=0x99b608) at 
config.c:157
#13 0x000000000043d071 in ap_invoke_handler (r=0x99b608) at 
config.c:372
#14 0x000000000046a2e0 in ap_process_request (r=0x99b608) at 
http_request.c:282
#15 0x00000000004679fd in ap_process_http_connection 
(c=0x9955b8) at http_core.c:190
#16 0x0000000000443693 in ap_run_process_connection 
(c=0x9955b8) at connection.c:43
#17 0x0000000000484870 in child_main (child_num_arg=Variable 
"child_num_arg" is not available.
) at prefork.c:662
#18 0x0000000000484ac4 in make_child (s=0x5d9990, slot=43) 
at prefork.c:758
#19 0x0000000000485649 in ap_mpm_run (_pconf=Variable 
"_pconf" is not available.
) at prefork.c:893
#20 0x000000000042a5b5 in main (argc=Variable "argc" is not 
available.
) at main.c:740

(gdb) print *result
$2 = {error = 0xb21e17 "index exact: query error: negation 
is only allowed at top level", warning = 0x0, status = 1, 
  num_fields = 0, fields = 0x0, num_attrs = 10190000, 
attr_names = 0x0, attr_types = 0x0, num_matches = 10189552, 
  values_pool = 0x0, total = 0, total_found = 0, time_msec = 
1601724781, num_words = 1701995617, words = 0x0}

As can be seen below, if the result is the above error 
(error = 0xb21e17 "index exact: query error: negation is 
only allowed at top level"), a segmentation fault happens 
and the Apache server crashes.