[UR] fix coverity issues

[AlexeySachkov]

This is a cherry-pick of #19817

[AlexeySachkov]

FAIL: SYCL :: Regression/barrier_with_work.cpp (111 of 1882)
******************** TEST 'SYCL :: Regression/barrier_with_work.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=level_zero:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=level_zero:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# note: command had no output on stdout or stderr
# RUN: at line 2
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=opencl:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=opencl:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# note: command had no output on stdout or stderr
# RUN: at line 2
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=1 ONEAPI_DEVICE_SELECTOR=level_zero:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=1 ONEAPI_DEVICE_SELECTOR=level_zero:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.event_list.out
# note: command had no output on stdout or stderr
# RUN: at line 4
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=level_zero:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=level_zero:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# note: command had no output on stdout or stderr
# RUN: at line 4
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=opencl:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=0 ONEAPI_DEVICE_SELECTOR=opencl:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# note: command had no output on stdout or stderr
# RUN: at line 4
env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1  env env UR_LOADER_USE_LEVEL_ZERO_V2=1 ONEAPI_DEVICE_SELECTOR=level_zero:gpu  /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# executed command: env SYCL_PI_LEVEL_ZERO_USE_MULTIPLE_COMMANDLIST_BARRIERS=1 env env UR_LOADER_USE_LEVEL_ZERO_V2=1 ONEAPI_DEVICE_SELECTOR=level_zero:gpu /__w/llvm/llvm/build-e2e/Regression/Output/barrier_with_work.cpp.tmp.queue_wide.out
# .---command stdout------------
# | Failed at 5000 with 0
# `-----------------------------
# error: command failed with exit status: 1

The change is essentially non-functional, so the failure here is likely something sporadic. However, I can't find any records of it.

I will proceed with merge and monitor the upcoming nightly to see if it reoccurs