2940 elfdump should return non-null on invalid file type

*** 972,981 ****
--- 972,982 ----
                  case ELF_K_ELF:
                          ret = decide(file, fd, elf, flags, wname, wfd, osabi);
                          break;
                  default:
                          (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADFILE), file);
+                         ret = 1;
                          break;
                  }
  
                  (void) close(fd);
                  (void) elf_end(elf);