unistr/*, uniconv/*: Fix undefined behaviour. Reported by Jeffrey Walton <noloader@gmail.com>. * lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size. * lib/unistr/u-cpy-alloc.h (FUNC): Likewise. * lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise. * lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.

# Suppress valgrind messages in an installed libunistring.

# Suppress a valgrind message about use of uninitialized memory in freea().
# This use is OK because it provides only a speedup.
{
    libunistring_freea
    Memcheck:Cond
    fun:libunistring_freea
}