[decompiler] fix missing casts issue (#573)

* fix casts issue

* fix bug

* one last small fix

test/decompiler/reference/engine/physics/dynamics-h_REF.gc

@@ -64,9 +64,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-1 0))
+(let ((v0-2 0))
   )
-
-
-
-

test/decompiler/reference/engine/physics/trajectory-h_REF.gc

@@ -33,9 +33,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-1 0))
+(let ((v0-2 0))
   )
-
-
-
-

test/decompiler/reference/engine/physics/trajectory_REF.gc

@@ -72,7 +72,7 @@
   (let ((f0-1 (/ (vector-vector-xz-distance arg1 arg0) arg2)))
    (TODO-RENAME-11 obj arg0 arg1 f0-1 arg3)
    )
-  (let ((v0-1 0))
+  (let ((v0-2 0))
    )
   (none)
   )