vfprintf.c: de-obfuscate if(with nested assignments). no logic changes
vfprintf.c: de-obfuscate if(with nested assignments). no logic changes

God knows this file is hard to read as-is, some readability improvement
is in order.

Signed-off-by: Denys Vlasenko <50fbbd36fe0f9c8261d4a3c762c8c29ffb35e48f@redhat.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc