Function xmlReallocZero 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlReallocZero(
    ptr: *mut c_void,
    old_size: usize,
    new_size: usize,
) -> *mut c_void

Reallocate and zero-initialize the new portion.

UPSTREAM-PARITY

Like xmlRealloc, but zeroes any newly allocated bytes.

SAFETY

Same as xmlRealloc.