Fix use-of-uninitialized-value with exception on deprecated const access #18478
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Caught by various tests in nightly. https://github.com/php/php-src/actions/runs/14767850964/job/41462688558
The use-of-uninitialized-value happens on this line:
php-src/Zend/zend_vm_def.h
Line 8192 in 178fc2d
It happens because because the ZEND_HANDLE_EXCEPTION handler assumes the result has already been initialized and potentially needs to be freed. To fix this, simply initialize the result to NULL, like we already do a few lines above.