in a custom allocator like

int *alloczero() {
    int *p = malloc(sizeof *p);

    if (*p)
        *p = 0;
    return p;
}

valgrind reports 'conditional jump..'
at line 'if (*p)', which is correct
and easy to suppress

but later whereever i read *p i get
'..uninitialised' value errors
eventhough it's clearly provably 0

now i'm wondering how to suppress these
warnings in a way that valgrind
understands that *p is 0

(the check is necessary because in
the code where it is used the page
is often zeroed out and we want to
aviod dirty pages)

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