remove useless parentheses + clippy fixes #95

Job	Run time
android_ndk_lts (aarch64-linux-android)	1m 29s
android_ndk_lts (armv7-linux-androideabi)	1m 42s
android_ndk_lts (x86_64-linux-android)	1m 30s
docker	3m 2s
android_ndk_lts (i686-linux-android)	1m 25s
http3_test	1m 11s
nginx (1.16.1)	57s
quiche	3m 38s
quiche_ios (x86_64-apple-ios)	2m 12s
quiche_macos	3m 17s
quiche (boringssl-boring-crate)	3m 29s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 34s
quiche_ios (aarch64-apple-ios)	3m 1s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 52s
quiche_multiarch (i686-unknown-linux-gnu)	2m 13s
quiche_windows (x86_64-pc-windows-msvc)	4m 30s
quiche_windows (i686-pc-windows-msvc)	4m 7s
quiche_windows (x86_64-pc-windows-gnu)	5m 54s
quiche_windows (i686-pc-windows-gnu)	4m 35s
	55m 38s

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