lock_rec_validate_page(): Disable the debug printout.

It is filling the error log when testing the debug version of the server.
The printout only seems to be useful when debugging a crash, not when
testing an instrumented version of the server.

storage/innobase/lock/lock0lock.c

@@ -4859,11 +4859,11 @@ loop:
 			ut_a(rec);
 			offsets = rec_get_offsets(rec, index, offsets,
 						  ULINT_UNDEFINED, &heap);
-
+#if 0
 			fprintf(stderr,
 				"Validating %lu %lu\n",
 				(ulong) space, (ulong) page_no);
-
+#endif
 			lock_mutex_exit_kernel();
 
 			/* If this thread is holding the file space