Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-5.2-pull-request' into staging

Coverity and compiler warning fixes

# gpg: Signature made Thu 05 Nov 2020 07:07:56 GMT
# gpg:                using RSA key CD2F75DDC8E3A4DC2E4F5173F30C38BD3F2FBE3C
# gpg:                issuer "laurent@vivier.eu"
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" [full]
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>" [full]
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" [full]
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier2/tags/linux-user-for-5.2-pull-request:
  linux-user: Check copy_from_user() return value in vma_dump_size()
  linux-user/syscall: Fix missing target_to_host_timespec64() check
  linux-user: Use "!= 0" when checking if MAP_FIXED_NOREPLACE is non-zero
  linux-user/mips/cpu_loop: silence the compiler warnings

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>