revert r18098 from trunk

src/util/fstarpu.c

@@ -505,7 +505,6 @@ void fstarpu_unpack_arg(char *cl_arg, void ***_buffer_list)
 		memcpy(argptr, cl_arg+current_arg_offset, arg_size);
 		current_arg_offset += arg_size;
 	}
-	free(cl_arg);
 }
 
 void fstarpu_sched_ctx_display_workers(int ctx)