Undefined sanitizers bugs

[qarmin]

thirdparty/spirv-reflect/spirv_reflect.c:293:37: runtime error: applying zero offset to null pointer
thirdparty/spirv-reflect/spirv_reflect.c:2205:19: runtime error: implicit conversion from type 'int' of value -2 (32-bit, signed) to type 'unsigned int' changed the value to 4294967294 (32-bit, unsigned)

not sure about reproduction steps

SPIRV-Reflect/spirv_reflect.c

Line 293 in 4bfcf15

const uint32_t* arr1_end = p_arr1 + arr1_size;

SPIRV-Reflect/spirv_reflect.c

Line 2205 in 4bfcf15

p_var->flags &= ~SPV_REFLECT_VARIABLE_FLAGS_UNUSED;