Clang warning fixes for 4.4 and 4.9

[Nathan Chancellor <natechancellor@gmail.com>]

Hi Greg,

Please apply the following commits to both 4.4 and 4.9:

9280cdd6fe5b ("fs: compat: Remove warning from COMPATIBLE_IOCTL")
342e91578eb6 ("selinux: Remove unnecessary check of array base in selinux_set_mapping()")
f7e30f01a9e2 ("cpumask: Add helper cpumask_available()")
d170fe7dd992 ("genirq: Use cpumask_available() for check of cpumask variable")
7c30f352c852 ("jiffies.h: declare jiffies and jiffies_64 with ____cacheline_aligned_in_smp")
60b0a8c3d248 ("frv: declare jiffies to be located in the .data section")
eee6ebbac18a ("netfilter: nf_nat_h323: fix logical-not-parentheses warning")
dae1a432ab1f ("Input: mousedev - fix implicit conversion warning")
e36215d87f30 ("dm ioctl: remove double parentheses")
76dc52684d0f ("PCI: Make PCI_ROM_ADDRESS_MASK a 32-bit constant")

Please apply the following commits to only 4.4:

c877ef8ae7b8 ("writeback: fix the wrong congested state variable definition")
452889788591 ("ACPI, PCI, irq: remove redundant check for null string pointer")
db0a6fb5d97a ("audit: add tty field to LOGIN event")

Please apply the following commits to only 4.9:

270e8573145a ("selinux: Remove redundant check for unknown labeling behavior")
82cd58805281 ("arm64: avoid overflow in VA_START and PAGE_OFFSET")
0dde10bed2c4 ("btrfs: Remove extra parentheses from condition in copy_items()")
a4ac6f2e53e5 ("mac80211: ibss: Fix channel type enum in ieee80211_sta_join_ibss()")
93f56de25937 ("mac80211: Fix clang warning about constant operand in logical operation")
a2b7cbdd2559 ("netfilter: ctnetlink: Make some parameters integer to avoid enum mismatch")
765a1077c85e ("HID: sony: Use LED_CORE_SUSPENDRESUME")
aa1702dd162f ("cfg80211: Fix array-bounds warning in fragment copy")
bbf67e450a5d ("nl80211: Fix enum type of variable in nl80211_put_sta_rate()")
1f3d62090d3b ("xgene_enet: remove bogus forward declarations")
8a8b161df5ce ("usb: gadget: remove redundant self assignment")

I have verified these all pick clean. I will send separate patches for
the fixes that did not. I have verified everything builds properly with
both GCC and Clang on arm and arm64.

Thanks!
Nathan