Fix use-after-free in OpenSSL empty cafile warning

[iluuu1994]

For context:

https://github.com/php/php-src/actions/runs/30059575887/job/89378471139

  ==95682==ERROR: AddressSanitizer: heap-use-after-free on address 0x511000b929c0 at pc 0x55fd3a139556 bp 0x7ffc2810e7b0 sp 0x7ffc2810e7a0
  READ of size 8 at 0x511000b929c0 thread T0
      #0 0x55fd3a139555 in php_stream_error /home/runner/work/php-src/php-src/main/streams/stream_errors.c:625
      #1 0x55fd37419153 in php_openssl_load_stream_cafile /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:932
      #2 0x55fd37419c86 in php_openssl_enable_peer_verification /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:971
      #3 0x55fd3742ba07 in php_openssl_create_server_ctx /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:2479
      #4 0x55fd3742ec22 in php_openssl_setup_crypto /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:2651
      #5 0x55fd3743b244 in php_openssl_sockop_set_option /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:3511
      #6 0x55fd3a1515e7 in _php_stream_set_option /home/runner/work/php-src/php-src/main/streams/streams.c:1419
      #7 0x55fd3a1613ef in php_stream_xport_crypto_setup /home/runner/work/php-src/php-src/main/streams/transports.c:366
      #8 0x55fd3743bcb3 in php_openssl_sockop_set_option /home/runner/work/php-src/php-src/ext/openssl/xp_ssl.c:3547
      #9 0x55fd3a1515e7 in _php_stream_set_option /home/runner/work/php-src/php-src/main/streams/streams.c:1419
      #10 0x55fd3a1602b9 in php_stream_xport_connect /home/runner/work/php-src/php-src/main/streams/transports.c:247
      #11 0x55fd3a15ebcc in _php_stream_xport_create /home/runner/work/php-src/php-src/main/streams/transports.c:144
      #12 0x55fd3995fa2c in zif_stream_socket_client /home/runner/work/php-src/php-src/ext/standard/streamsfuncs.c:171
      #13 0x55fd3a699bb0 in ZEND_DO_FCALL_BY_NAME_SPEC_RETVAL_USED_HANDLER /home/runner/work/php-src/php-src/Zend/zend_vm_execute.h:1767
      #14 0x55fd38b7ed43 in zend_jit_trace_execute /home/runner/work/php-src/php-src/ext/opcache/jit/zend_jit_vm_helpers.c:1070
      #15 0x55fd38e4d681 in zend_jit_trace_hot_root ext/opcache/jit/zend_jit_trace.c:8195
      #16 0x7f6e2a1344f5  (/dev/zero (deleted)+0x100004f5)