Add C11 error checking to vsnprintf()

C11 specifies that vsnprintf() is to check for the following conditions:
- output buffer or format string are null pointers
- buffer size is zero

C11 also specifies "constraint handler functions" that may be set, but that's far more involved, and having at least some error-handling for bad arguments like these is probably quite useful.

Source: https://en.cppreference.com/w/c/io/vfprintf#:~:text=5%2D8),constraint%20handler%20function%3A

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