drm/msm: drop unnecessary set_need_resched()

This was inherited from i915/udl, and not actually needed.
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_gem.c

@@ -159,7 +159,6 @@ int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 out:
 	switch (ret) {
 	case -EAGAIN:
-		set_need_resched();
 	case 0:
 	case -ERESTARTSYS:
 	case -EINTR: