linux-user/signal.c: PPC: Silence clang uninitialized-use warning

linux-user/signal.c: PPC: Silence clang uninitialized-use warning

Silence a clang warning in a PPC signal return function:

/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/signal.c:4611:9: error: variable 'sr_addr' is used
      uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
    if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1))
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/signal.c:4636:28: note: uninitialized use occurs here
    unlock_user_struct(sr, sr_addr, 1);
                           ^~~~~~~
/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/qemu.h:442:27: note: expanded from macro 'unlock_user_struct'
    unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
                          ^

This happens when we unlock a user struct which we never
attempted to lock. Strictly, clang is actually wrong here -- it
hasn't been able to spot that unlock_user_struct() doesn't use
its second argument if the first is NULL. However it doesn't
seem too unreasonable to demand that we pass in initialized
values to it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1375095632-13735-2-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>