slightly OT: c expression evaluation order

[Michael Jung]

Hello,

this is slightly of topic for this mailing list. However, it would be nice if
someone could answer my question. I've seen that Alexandre changed the if
statement expression in one of my patches from

if (pszProvider ? *pszProvider == '\0' : 1)

to

if (!pszProvider || !*pszProvider)

I've always thought that the order in which subexpressions are evaluated is
not specified in the C language. Isn't there the danger of a NULL pointer
dereference given here?

Thanks,
Michael