That has merit. Personally I usually find myself doing something more like this:

   if (argc != 3) {
      printf ("Wrong number of arguments");
      // throw an exception or return NULL or something
   }

   if (!fname) {
      printf ("File name cannot be null");
      // throw an exception or return NULL or something
   }

   /* Do stuff */

The important thing, to my mind, is the absence of an else block.