fix memleak due to missing pthread_attr_destroy()-call

[realFlowControl]

Hey there 👋

I just added PHP 8.3 with ASAN to ext-parallel and it is failing. The stack traces I attached led me to the docs of the pthread_getattr_np() call where it is stated that:

When the thread attributes object returned by pthread_getattr_np() is no longer required, it should be destroyed using pthread_attr_destroy(3).

The implementation of pthread_attr_setaffinity_np() (which is called by pthread_getattr_np()) does some allocations, that are freed in the pthread_attr_destroy() function, so I added this call. It looks like this code is related to #9104, so I'd appreciate a review from @arnaud-lb.

With the proposed changes, ASAN in ext-parallel is green again. I can not rule out, that I missed something, or that I am just misusing the API in some way.

This is the stack trace ASAN is showing locally:

Direct leak of 152 byte(s) in 1 object(s) allocated from:
#0 0xffff96b0a4b4 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
#1 0xffff9688ad30 (/lib/aarch64-linux-gnu/libc.so.6+0x7ad30)
#2 0xffff9688b098 in pthread_attr_setaffinity_np (/lib/aarch64-linux-gnu/libc.so.6+0x7b098)
#3 0xffff9688e7b0 in pthread_getattr_np (/lib/aarch64-linux-gnu/libc.so.6+0x7e7b0)
#4 0xaaaabe8c9820 in zend_call_stack_get_linux_pthread /opt/src/php-src/Zend/zend_call_stack.c:120
#5 0xaaaabe8c9e28 in zend_call_stack_get_linux /opt/src/php-src/Zend/zend_call_stack.c:239
#6 0xaaaabe8c9e98 in zend_call_stack_get /opt/src/php-src/Zend/zend_call_stack.c:511
#7 0xaaaabe8c9078 in zend_call_stack_init /opt/src/php-src/Zend/zend_call_stack.c:63
#8 0xaaaabe9896d4 in zend_new_thread_end_handler /opt/src/php-src/Zend/zend.c:848
#9 0xaaaabe75d030 in allocate_new_resource /opt/src/php-src/TSRM/TSRM.c:412
#10 0xaaaabe75d39c in ts_resource_ex /opt/src/php-src/TSRM/TSRM.c:461
#11 0xffff9377e1f8 (<unknown module>)
#12 0xffff93780b88 (<unknown module>)
#13 0xffff9688d5c4 (/lib/aarch64-linux-gnu/libc.so.6+0x7d5c4)
#14 0xffff968f5ed8 (/lib/aarch64-linux-gnu/libc.so.6+0xe5ed8)
Indirect leak of 32 byte(s) in 1 object(s) allocated from:
#0 0xffff96b0a69c in __interceptor_realloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:164
#1 0xffff9688b0bc in pthread_attr_setaffinity_np (/lib/aarch64-linux-gnu/libc.so.6+0x7b0bc)
#2 0xffff9688e7b0 in pthread_getattr_np (/lib/aarch64-linux-gnu/libc.so.6+0x7e7b0)
#3 0xaaaabe8c9820 in zend_call_stack_get_linux_pthread /opt/src/php-src/Zend/zend_call_stack.c:120
#4 0xaaaabe8c9e28 in zend_call_stack_get_linux /opt/src/php-src/Zend/zend_call_stack.c:239
#5 0xaaaabe8c9e98 in zend_call_stack_get /opt/src/php-src/Zend/zend_call_stack.c:511
#6 0xaaaabe8c9078 in zend_call_stack_init /opt/src/php-src/Zend/zend_call_stack.c:63
#7 0xaaaabe9896d4 in zend_new_thread_end_handler /opt/src/php-src/Zend/zend.c:848
#8 0xaaaabe75d030 in allocate_new_resource /opt/src/php-src/TSRM/TSRM.c:412
#9 0xaaaabe75d39c in ts_resource_ex /opt/src/php-src/TSRM/TSRM.c:461
#10 0xffff9377e1f8 (<unknown module>)
#11 0xffff93780b88 (<unknown module>)
#12 0xffff9688d5c4 (/lib/aarch64-linux-gnu/libc.so.6+0x7d5c4)
#13 0xffff968f5ed8 (/lib/aarch64-linux-gnu/libc.so.6+0xe5ed8)
SUMMARY: AddressSanitizer: 184 byte(s) leaked in 2 allocation(s).

[realFlowControl]

The failing ASAN test is the same that's failing in PHP-8.3 branch from where I branched off and seems unrelated to me.

[arnaud-lb]

This looks good to me apart from one comment

[arnaud-lb]

Thank you!