Incorrect warning message?

It's an example:

void c(const char *s){}
void cc(const char **p){}
void x()
{
    char *s;
    c(s);
    cc(&s);
}

And it's the warning GCC produces for it:

bug.c: In function `x':
bug.c:7: warning: passing arg 1 of `cc' from incompatible pointer type

Is this message correct?  Doesn't the <const char> for the second
defun's declaration mean exactly the same as it means for the first -
the fact that defun doesn't modify the content of the corresponding
array?