Cleanup: rename BKE_pose_channel_{verify => ensure}

The term `verify` doesn't fit with what this function does
and is sometimes used to check data is valid or to control validity
checking as with `RNA_define_verify_sdna`.
use more common term `ensure`.

source/blender/blenkernel/intern/action.c

@@ -635,7 +635,7 @@ bPoseChannel *BKE_pose_channel_find_name(const bPose *pose, const char *name)
  * \note Use with care, not on Armature poses but for temporal ones.
  * \note (currently used for action constraints and in rebuild_pose).
  */
-bPoseChannel *BKE_pose_channel_verify(bPose *pose, const char *name)
+bPoseChannel *BKE_pose_channel_ensure(bPose *pose, const char *name)
 {
   bPoseChannel *chan;
 
@@ -1191,7 +1191,7 @@ void BKE_pose_free(bPose *pose)
  * and ID-Props, used when duplicating bones in editmode.
  * (unlike copy_pose_channel_data which only does posing-related stuff).
  *
- * \note use when copying bones in editmode (on returned value from #BKE_pose_channel_verify)
+ * \note use when copying bones in editmode (on returned value from #BKE_pose_channel_ensure)
  */
 void BKE_pose_channel_copy_data(bPoseChannel *pchan, const bPoseChannel *pchan_from)
 {