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[uri] Handle an empty unparse_uri() result properly
Previously, if none of the URI parts requested existed in the passed URI, unparse_uri() would not touch the destination buffer at all; this could lead to use of uninitialized data. Fix by setting buf[0] = '\0' before unparsing whenever we have room to do so. Signed-off-by: Joshua Oreman <oremanj@rwcr.net> Signed-off-by: Marty Connor <mdc@etherboot.org>
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