Don't call memcpy with NULL as 1st parameter.

This is illegal according to the C standard, sec. 7.1.4.

"If an argument to a function has an invalid value (such as a value
outside the domain of the function, or a pointer outside the address
space of the program, or a null pointer, or a pointer to non-modifiable
storage when the corresponding parameter is not const-qualified) or a
type (after promotion) not expected by a function with variable number
of arguments, the behavior is undefined."

7.24.1(2): "Where an argument declared as size_t n specifies the length
of the array for a function, n can have the value zero […] pointer
arguments on such a call shall still have valid values, as described in
7.1.4."

See https://www.imperialviolet.org/2016/06/26/nonnull.html

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