Fixed defects

List of Defects

Error: CPPCHECK_WARNING (CWE-457): [#def1]
liburing-2.5-build/liburing-2.5/examples/send-zerocopy.c:122: error[uninitvar]: Uninitialized variable: &mask
#  120|   		return;
#  121|   
#  122|-> 	ret = io_uring_register_iowq_aff(ring, 1, &mask);
#  123|   	if (ret)
#  124|   		t_error(1, ret, "unabled to set io-wq affinity\n");

Error: CLANG_WARNING: [#def2]
liburing-2.5-build/liburing-2.5/test/pollfree.c:364:5: warning[deadcode.DeadStores]: Value stored to 'res' is never read
#  362|       *(uint32_t*)0x20000a98 = -1;
#  363|       memset((void*)0x20000a9c, 0, 12);
#  364|->     res = -1;
#  365|       res = syz_io_uring_setup(0x87, 0x20000a80, 0x206d6000, 0x206d7000,
#  366|                                0x20000000, 0x20000040);

Error: CPPCHECK_WARNING: [#def3]
liburing-2.5-build/liburing-2.5/test/sqpoll-cancel-hang.c: information[normalCheckLevelMaxBranches]: Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.

Error: CLANG_WARNING: [#def4]
liburing-2.5-build/liburing-2.5/test/sqpoll-cancel-hang.c:112:5: warning[deadcode.DeadStores]: Value stored to 'res' is never read
#  110|       *(uint32_t*)0x20000218 = -1;
#  111|       memset((void*)0x2000021c, 0, 12);
#  112|->     res = -1;
#  113|       res = syz_io_uring_setup(0x7987, 0x20000200, 0x20400000, 0x20ffd000, 0x200000c0, 0x200001c0);
#  114|       if (res != -1) {

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