accel/ivpu: avoid duplicate assignment

With extra warnings enabled, gcc warns about two assignments
of the same .mmap callback:

In file included from drivers/accel/ivpu/ivpu_drv.c:10:
include/drm/drm_accel.h:31:27: error: initialized field overwritten [-Werror=override-init]
   31 |         .mmap           = drm_gem_mmap
      |                           ^~~~~~~~~~~~
drivers/accel/ivpu/ivpu_drv.c:360:9: note: in expansion of macro 'DRM_ACCEL_FOPS'
  360 |         DRM_ACCEL_FOPS,
      |         ^~~~~~~~~~~~~~

Remove the unused local assignment.

Fixes: e868cc5 ("accel: Add .mmap to DRM_ACCEL_FOPS")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Signed-off-by: Jacek Lawrynowicz <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/accel/ivpu/ivpu_drv.c

@@ -356,7 +356,6 @@ int ivpu_shutdown(struct ivpu_device *vdev)
 
 static const struct file_operations ivpu_fops = {
 	.owner		= THIS_MODULE,
-	.mmap           = drm_gem_mmap,
 	DRM_ACCEL_FOPS,
 };