Minor formatting cleanup

Former-commit-id: 111d3b0d70

src/Runtime/ptmf.c

@@ -4,7 +4,7 @@ typedef struct PTMF {
   long vtbl_offset; // offset in vtable (-1: not a virtual function)
   union {
     void* func_addr;    //nonvirtual function address
-    long ventry_offset; //	offset of virtual function entry in vtable
+    long ventry_offset; // of virtual function entry in vtable
   } func_data;
 } PTMF;