Use Tcl_Free() for arguments allocated with Tcl_SplitList().
Use Tcl_Alloc() for arguments passed to tcl to be freed by TCL_DYNAMIC.

https://bugs.gentoo.org/757924
--- a/tclhfs.c
+++ b/tclhfs.c
@@ -1313,7 +1313,7 @@ int cmd_hfs(ClientData clientData, Tcl_Interp *interp,
 	  badblocks = ALLOCX(unsigned long, listc);
 	  if (listc && badblocks == 0)
 	    {
-	      free(listv);
+	      Tcl_Free((char *) listv);
 
 	      interp->result = "out of memory";
 	      return TCL_ERROR;
@@ -1324,13 +1324,13 @@ int cmd_hfs(ClientData clientData, Tcl_Interp *interp,
 	      if (Tcl_ExprLong(interp, listv[i],
 			       (long *) &badblocks[i]) != TCL_OK)
 		{
-		  free(listv);
+		  Tcl_Free((char *) listv);
 		  FREE(badblocks);
 		  return TCL_ERROR;
 		}
 	    }
 
-	  free(listv);
+	  Tcl_Free((char *) listv);
 
 	  if (do_format(argv[2], partno, 0, argv[4], listc, badblocks) == -1)
 	    {
--- a/tclhfs.c
+++ b/tclhfs.c
@@ -378,7 +378,7 @@ int file_cmd(ClientData clientData, Tcl_Interp *interp,
 	      return TCL_ERROR;
 	    }
 
-	  mem = ALLOC(char, bytes + 1);
+	  mem = Tcl_Alloc(bytes + 1);
 	  if (mem == 0)
 	    {
 	      interp->result = "out of memory";
--- a/tclhfs.c
+++ b/tclhfs.c
@@ -902,7 +902,7 @@ int vol_cmd(ClientData clientData, Tcl_Interp *interp,
 	    }
 
 	  result = Tcl_Merge(listc, listv);
-	  free(listv);
+	  Tcl_Free((char *)listv);
 
 	  Tcl_SetResult(interp, result, TCL_DYNAMIC);
 	}
@@ -1038,7 +1038,7 @@ int vol_cmd(ClientData clientData, Tcl_Interp *interp,
 	    return TCL_ERROR;
 
 	  fargv = hfs_glob(vol, listc, listv, &fargc);
-	  free(listv);
+	  Tcl_Free((char*)listv);
 
 	  if (fargv == 0)
 	    {