error message for lack of boot/cleanup function

[Zefram <zefram@xxxxxxxxxxxxxxxxx>]

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The patch makes zmodload give an error message if a module's boot or
cleanup function couldn't be found.  Previously it just silently failed,
which can be confusing and is certainly unhelpful.

 -zefram

      *** Src/module.c	1996/12/24 02:09:54	1.17
      --- Src/module.c	1996/12/24 02:31:26
      ***************
      *** 195,201 ****
            sprintf(buf, "boot_%s", s);
        #endif
            fn = (Module_func) dlsym(m->handle, buf);
      !     return fn ? fn(m) : 1;
        }
        
        /**/
      --- 195,204 ----
            sprintf(buf, "boot_%s", s);
        #endif
            fn = (Module_func) dlsym(m->handle, buf);
      !     if(fn)
      ! 	return fn(m);
      !     zwarnnam(m->nam, "no boot function", NULL, 0);
      !     return 1;
        }
        
        /**/
      ***************
      *** 270,276 ****
            sprintf(buf, "cleanup_%s", s);
        #endif
            fn = (Module_func) dlsym(m->handle, buf);
      !     return fn ? fn(m) : 1;
        }
        
        /**/
      --- 273,282 ----
            sprintf(buf, "cleanup_%s", s);
        #endif
            fn = (Module_func) dlsym(m->handle, buf);
      !     if(fn)
      ! 	return fn(m);
      !     zwarnnam(m->nam, "no cleanup function", NULL, 0);
      !     return 1;
        }
        
        /**/

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