fix: prevent NULL pointer dereference in cJSON_SetNumberHelper (#991) #328

Job	Run time
macos (ENABLE_VALGRIND, GCC)	19s
linux (ENABLE_SANITIZERS, CLANG)	41s
macos (NONE_MEM_CHECK, CLANG)	17s
linux (NONE_MEM_CHECK, GCC)	46s
linux (ENABLE_VALGRIND, CLANG)	35s
macos (ENABLE_SANITIZERS, GCC)	23s
macos (ENABLE_VALGRIND, CLANG)	20s
macos (NONE_MEM_CHECK, GCC)	18s
macos (ENABLE_SANITIZERS, CLANG)	17s
linux (ENABLE_VALGRIND, GCC)	40s
linux (ENABLE_SANITIZERS, GCC)	34s
linux (NONE_MEM_CHECK, CLANG)	37s
	5m 47s

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