Incorporate rmustacc's review feedback.

*** 8,18 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
   */
  
  /*
   * Common handling for test programs.
   */
--- 8,18 ----
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2015 Garrett D'Amore <garrett@damore.org>
   */
  
  /*
   * Common handling for test programs.
   */
*** 169,178 ****
--- 169,179 ----
          } else {
                  (void) printf("TEST SUMMARY: %d / %d (%d failing)\n",
                      passes, tests, tests - passes);
          }
  }
+ 
  void
  test_debugf(test_t t, const char *format, ...)
  {
          va_list args;
  
*** 277,295 ****
          char            *err;
          int             lineno;
          int             rv;
          int             found;
          char            path[MAXPATHLEN];
  
          va_start(va, fname);
!         for (int i = 0; i < MAXCB; i++) {
                  keyws[i] = (const char *)va_arg(va, const char *);
                  if (keyws[i] == NULL)
                          break;
                  callbs[i] = (test_cfg_func_t)va_arg(va, test_cfg_func_t);
          }
          va_end(va);
  
          found = 0;
  
          if (access(fname, F_OK) == 0) {
                  found++;
--- 278,300 ----
          char            *err;
          int             lineno;
          int             rv;
          int             found;
          char            path[MAXPATHLEN];
+         int             i;
  
          va_start(va, fname);
!         for (i = 0; i < MAXCB; i++) {
                  keyws[i] = (const char *)va_arg(va, const char *);
                  if (keyws[i] == NULL)
                          break;
                  callbs[i] = (test_cfg_func_t)va_arg(va, test_cfg_func_t);
          }
          va_end(va);
+         if (i == MAXCB) {
+                 test_debugf(t, "too many arguments to function >= %d", MAXCB);
+         }
  
          found = 0;
  
          if (access(fname, F_OK) == 0) {
                  found++;