[BUG] Phalcon\Cache\Backend\Apc::save() frees too much memory

[ghost]

==15687== Invalid read of size 4
==15687==    at 0xAABA74: _zval_ptr_dtor (zend.h:385)
==15687==    by 0xAFA05C: zend_vm_stack_clear_multiple (zend_execute.h:318)
==15687==    by 0xB0102C: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:413)
==15687==    by 0xB01111: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:428)
==15687==    by 0xAFF5AF: execute (zend_vm_execute.h:107)
==15687==    by 0xAC232C: zend_execute_scripts (zend.c:1259)
==15687==    by 0xA1AF97: php_execute_script (main.c:2316)
==15687==    by 0xBCE138: main (php_cli.c:1189)
==15687==  Address 0x19d00660 is 16 bytes inside a block of size 32 free'd
==15687==    at 0x4C2BA6C: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15687==    by 0xA8F610: _efree (zend_alloc.c:2358)
==15687==    by 0xAABB34: _zval_ptr_dtor (zend_execute_API.c:448)
==15687==    by 0x115187D8: zim_Phalcon_Cache_Backend_Apc_save (apc.c:196)
==15687==    by 0xB0069E: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:322)
==15687==    by 0xB01111: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:428)
==15687==    by 0xAFF5AF: execute (zend_vm_execute.h:107)
==15687==    by 0xAC232C: zend_execute_scripts (zend.c:1259)
==15687==    by 0xA1AF97: php_execute_script (main.c:2316)
==15687==    by 0xBCE138: main (php_cli.c:1189)
==15687== 
==15687== Invalid write of size 4
==15687==    at 0xAABA7E: _zval_ptr_dtor (zend.h:385)
==15687==    by 0xAFA05C: zend_vm_stack_clear_multiple (zend_execute.h:318)
==15687==    by 0xB0102C: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:413)
==15687==    by 0xB01111: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:428)
==15687==    by 0xAFF5AF: execute (zend_vm_execute.h:107)
==15687==    by 0xAC232C: zend_execute_scripts (zend.c:1259)
==15687==    by 0xA1AF97: php_execute_script (main.c:2316)
==15687==    by 0xBCE138: main (php_cli.c:1189)
==15687==  Address 0x19d00660 is 16 bytes inside a block of size 32 free'd
==15687==    at 0x4C2BA6C: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15687==    by 0xA8F610: _efree (zend_alloc.c:2358)
==15687==    by 0xAABB34: _zval_ptr_dtor (zend_execute_API.c:448)
==15687==    by 0x115187D8: zim_Phalcon_Cache_Backend_Apc_save (apc.c:196)
==15687==    by 0xB0069E: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:322)
==15687==    by 0xB01111: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:428)
==15687==    by 0xAFF5AF: execute (zend_vm_execute.h:107)
==15687==    by 0xAC232C: zend_execute_scripts (zend.c:1259)
==15687==    by 0xA1AF97: php_execute_script (main.c:2316)
==15687==    by 0xBCE138: main (php_cli.c:1189)

[ghost]

Fixed in d551b09