more C standard compat fixes from Dan Fandrich

function                                             old     new   delta
docolon                                              207     204      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

miscutils/dc.c

@@ -182,7 +182,7 @@ static const struct op operators[] = {
 	{"p", print_no_pop},
 	{"f", print_stack_no_pop},
 	{"o", set_output_base},
-	{ /* zero filled */ }
+	{ "", NULL }
 };
 
 static void stack_machine(const char *argument)

miscutils/watchdog.c

@@ -33,7 +33,7 @@ int watchdog_main(int argc, char **argv)
 	static const struct suffix_mult suffixes[] = {
 		{ "ms", 1 },
 		{ "", 1000 },
-		{ }
+		{ "", 0 }
 	};
 
 	unsigned opts;