Cleanup: use C comments for descriptive text

Follow our code style guide by using C-comments for text descriptions.

source/blender/ikplugin/intern/iksolver_plugin.c

@@ -89,12 +89,12 @@ static void initialize_posetree(struct Object *UNUSED(ob), bPoseChannel *pchan_t
   for (curchan = pchan_tip; curchan; curchan = curchan->parent) {
     pchan_root = curchan;
 
-    curchan->flag |= POSE_CHAIN;  // don't forget to clear this
+    curchan->flag |= POSE_CHAIN; /* don't forget to clear this */
     chanlist[segcount] = curchan;
     segcount++;
 
     if (segcount == data->rootbone || segcount > 255) {
-      break;  // 255 is weak
+      break; /* 255 is weak */
     }
   }
   if (!segcount) {
@@ -220,7 +220,7 @@ static void make_dmats(bPoseChannel *pchan)
   if (pchan->parent) {
     float iR_parmat[4][4];
     invert_m4_m4(iR_parmat, pchan->parent->pose_mat);
-    mul_m4_m4m4(pchan->chan_mat, iR_parmat, pchan->pose_mat);  // delta mat
+    mul_m4_m4m4(pchan->chan_mat, iR_parmat, pchan->pose_mat); /* delta mat */
   }
   else {
     copy_m4_m4(pchan->chan_mat, pchan->pose_mat);
@@ -231,7 +231,7 @@ static void make_dmats(bPoseChannel *pchan)
 /* formula: pose_mat(b) = pose_mat(b-1) * diffmat(b-1, b) * ik_mat(b) */
 /* to make this work, the diffmats have to be precalculated! Stored in chan_mat */
 static void where_is_ik_bone(bPoseChannel *pchan,
-                             float ik_mat[3][3])  // nr = to detect if this is first bone
+                             float ik_mat[3][3]) /* nr = to detect if this is first bone */
 {
   float vec[3], ikmat[4][4];
 
@@ -594,8 +594,8 @@ void iksolver_initialize_tree(struct Depsgraph *UNUSED(depsgraph),
   bPoseChannel *pchan;
 
   for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
-    if (pchan->constflag & PCHAN_HAS_IK) {  // flag is set on editing constraints
-      initialize_posetree(ob, pchan);       // will attach it to root!
+    if (pchan->constflag & PCHAN_HAS_IK) { /* flag is set on editing constraints */
+      initialize_posetree(ob, pchan);      /* will attach it to root! */
     }
   }
   ob->pose->flag &= ~POSE_WAS_REBUILT;
@@ -618,7 +618,7 @@ void iksolver_execute_tree(struct Depsgraph *depsgraph,
 
     /* 4. walk over the tree for regular solving */
     for (a = 0; a < tree->totchannel; a++) {
-      if (!(tree->pchan[a]->flag & POSE_DONE)) {  // successive trees can set the flag
+      if (!(tree->pchan[a]->flag & POSE_DONE)) { /* successive trees can set the flag */
         BKE_pose_where_is_bone(depsgraph, scene, ob, tree->pchan[a], ctime, 1);
       }
       /* Tell blender that this channel was controlled by IK,