If it is specified as NULL read_full_file() assumes the caller wants a C string, and it looks for embedded NUL bytes to ensure that works. Given we don#t actually use the size argument here, let's drop it. (in one case the size argument is used, but not for actually processing the full returned data, but just as a shortcut to compare things with the original string. Let's drop use of that there, too given the risk of embedded NUL bytes in the data read.)
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