arm64: Remove the __user annotation for the restore_za_context() argument

The struct user_ctx *user pointer passed to restore_za_context() is not
a user point but a structure containing several __user pointers. Remove
the __user annotation.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Fixes: 39782210 ("arm64/sme: Implement ZA signal handling")
Reported-by: kernel test robot <lkp@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220601171338.2143625-1-catalin.marinas@arm.comSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/signal.c

@@ -385,7 +385,7 @@ static int preserve_za_context(struct za_context __user *ctx)
 	return err ? -EFAULT : 0;
 }
 
-static int restore_za_context(struct user_ctxs __user *user)
+static int restore_za_context(struct user_ctxs *user)
 {
 	int err;
 	unsigned int vq;