drm/i915: Remove unused bits of i915_vma/active api

When reworking the code to move the eviction fence to the object,
the best code is removed code.

Remove some functions that are unused, and change the function definition
if it's only used in 1 place.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
[mlankhorst: Remove new use of i915_active_has_exclusive]
Link: https://patchwork.freedesktop.org/patch/msgid/20211216142749.1966107-2-maarten.lankhorst@linux.intel.com
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 927f0d4..921d5b9 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -356,22 +356,18 @@ int i915_vma_wait_for_bind(struct i915_vma *vma)
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
 static int i915_vma_verify_bind_complete(struct i915_vma *vma)
 {
-	int err = 0;
+	struct dma_fence *fence = i915_active_fence_get(&vma->active.excl);
+	int err;
 
-	if (i915_active_has_exclusive(&vma->active)) {
-		struct dma_fence *fence =
-			i915_active_fence_get(&vma->active.excl);
+	if (!fence)
+		return 0;
 
-		if (!fence)
-			return 0;
+	if (dma_fence_is_signaled(fence))
+		err = fence->error;
+	else
+		err = -EBUSY;
 
-		if (dma_fence_is_signaled(fence))
-			err = fence->error;
-		else
-			err = -EBUSY;
-
-		dma_fence_put(fence);
-	}
+	dma_fence_put(fence);
 
 	return err;
 }
@@ -1249,7 +1245,7 @@ __i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma)
 	return __i915_request_await_exclusive(rq, &vma->active);
 }
 
-int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
+static int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
 {
 	int err;