Fix out-of-memory case in cJSON #2879

Job	Run time
codegen	35s
chromium	1m 24s
linux-32 (Debug)	1m 55s
linux (gcc, g++, Debug, ubuntu-20.04)	3m 20s
linux-32 (Release)	2m 26s
linux-32-no-asm	2m 20s
linux (gcc, g++, Debug, ubuntu-22.04)	3m 16s
linux-no-asm	3m 17s
linux (gcc, g++, Release, ubuntu-20.04)	6m 58s
linux (gcc, g++, Release, ubuntu-22.04)	6m 55s
linux (clang, clang++, Debug, ubuntu-20.04)	2m 11s
linux (clang, clang++, Debug, ubuntu-22.04)	3m 34s
linux (clang, clang++, Release, ubuntu-20.04)	4m 59s
linux (clang, clang++, Release, ubuntu-22.04)	4m 56s
windows_clang (clang, Debug)	4m 36s
windows_vs (Win32, Debug)	5m 21s
windows_clang (clang, Release)	3m 44s
windows_vs (Win32, Release)	4m 57s
windows_vs-no-asm (Win32)	4m 46s
windows_clang (clang-cl, Debug)	4m 3s
windows_vs (x64, Debug)	5m 1s
windows_vs-no-asm (x64)	3m 54s
mingw	1m 12s
windows_clang (clang-cl, Release)	4m 55s
windows_vs (x64, Release)	4m 35s
mingw-no-asm	1m 24s
mingw-use-gas	1m 15s
mingw-no-asm-explicit	1m 39s
iOS	1m 33s
Universal Binary Testing (STATIC ON) w/ Ninja	2m 0s
tvOS	41s
mac (Debug, APPLE_STATIC_LOADER=ON)	3m 27s
Universal Binary Testing (STATIC ON) w/ Xcode	3m 22s
Universal Binary Testing (STATIC OFF) w/ Ninja	2m 35s
mac (Debug, APPLE_STATIC_LOADER=OFF)	4m 2s
mac (Release, APPLE_STATIC_LOADER=ON)	3m 50s
mac (Release, APPLE_STATIC_LOADER=OFF)	6m 4s
Universal Binary Testing (STATIC OFF) w/ Xcode	3m 33s
	2h 10m 35s

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