vfio/cdx: Add parentheses between bitwise AND expression and logical NOT

When building with clang, there is a warning (or error with
CONFIG_WERROR=y) due to a bitwise AND and logical NOT in
vfio_cdx_bm_ctrl():

  drivers/vfio/cdx/main.c:77:6: error: logical not is only applied to the left hand side of this bitwise operator [-Werror,-Wlogical-not-parentheses]
     77 |         if (!vdev->flags & BME_SUPPORT)
        |             ^            ~
  drivers/vfio/cdx/main.c:77:6: note: add parentheses after the '!' to evaluate the bitwise operator first
     77 |         if (!vdev->flags & BME_SUPPORT)
        |             ^
        |              (                        )
  drivers/vfio/cdx/main.c:77:6: note: add parentheses around left hand side expression to silence this warning
     77 |         if (!vdev->flags & BME_SUPPORT)
        |             ^
        |             (           )
  1 error generated.

Add the parentheses as suggested in the first note, which is clearly
what was intended here.

Closes: https://github.com/ClangBuiltLinux/linux/issues/1939
Fixes: 8a97ab9b ("vfio-cdx: add bus mastering device feature support")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20231002-vfio-cdx-logical-not-parentheses-v1-1-a8846c7adfb6@kernel.orgSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/cdx/main.c

@@ -74,7 +74,7 @@ static int vfio_cdx_bm_ctrl(struct vfio_device *core_vdev, u32 flags,
 	struct vfio_device_feature_bus_master ops;
 	int ret;
 
-	if (!vdev->flags & BME_SUPPORT)
+	if (!(vdev->flags & BME_SUPPORT))
 		return -ENOTTY;
 
 	ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_SET,