Fix clang -Wvarargs compile errors

error: passing an object that undergoes default argument promotion to
'va_start' has undefined behavior [-Werror,-Wvarargs]

Change-Id: Id342beea916ec73e29e399087532caecfa19055f
Signed-off-by: Damjan Marion <damarion@cisco.com>

src/vnet/bier/bier_test.c

@@ -158,7 +158,7 @@ bier_test_mk_intf (u32 ninterfaces)
 
 static int
 bier_test_validate_entry (index_t bei,
-                          u16 n_buckets,
+                          int n_buckets,
                           ...)
 {
     dpo_id_t dpo = DPO_INVALID;

src/vnet/fib/fib_test.c

@@ -355,7 +355,7 @@ fib_test_validate_rep_v (const replicate_t *rep,
 
 int
 fib_test_validate_lb_v (const load_balance_t *lb,
-			u16 n_buckets,
+			int n_buckets,
 			va_list *ap)
 {
     const dpo_id_t *dpo;
@@ -603,7 +603,7 @@ fib_test_validate_lb_v (const load_balance_t *lb,
 
 int
 fib_test_validate_lb (const dpo_id_t *dpo,
-                     u16 n_buckets,
+                     int n_buckets,
                      ...)
 {
     const load_balance_t *lb;

src/vnet/fib/fib_test.h

@@ -118,11 +118,11 @@ extern int fib_test_validate_rep_v(const replicate_t *rep,
                                    va_list *ap);
 
 extern int fib_test_validate_lb_v(const load_balance_t *lb,
-                                  u16 n_buckets,
+                                  int n_buckets,
                                   va_list *ap);
 
 extern int fib_test_validate_lb(const dpo_id_t *dpo,
-				u16 n_buckets,
+				int n_buckets,
 				...);
 
 extern int fib_test_validate_entry(fib_node_index_t fei,