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Don't use G_LIKELY() in macros commonly used in g_return_if_fail()
g_return_if_fail() puts itself its condition in a G_LIKELY() clause,
and nested G_LIKELY() lead to warnings about shadowed variables, as
well as not being of any use.
Also, hiding G_LIKELY() in a macro may lead to unexpected use of it
which may hint the compiler incorrectly.