[io] avoid unnecessary heap allocation in TFile::MakeFree #15702

Job	Run time
Windows 10 x64 Release	1h 0m 54s
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	25m 26s
Windows 10 x86 Release	1h 50m 43s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 7m 56s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 29m 4s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	57m 35s
fedora41 LLVM_ENABLE_ASSERTIONS=On	1h 24m 15s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	47m 51s
Upload Event Payload	2s
alma8 LLVM_ENABLE_ASSERTIONS=On	1h 20m 31s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 56m 20s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 21m 14s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 20m 47s
ubuntu2410 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	3h 2m 23s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	46m 0s
alma9 modules_off runtime_cxxmodules=Off	47m 32s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	1h 35m 0s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo	49m 45s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	47m 56s
	1d 0h 51m 14s

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