zebra: Allow dplane to pass larger number of nexthops down to dataplane

Currently FRR is limiting the nexthop count to a uint8_t not a
uint16_t.  This leads to issues when the nexthop count is 256
which results in the count to overflow to 0 causing problems
in the code.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

zebra/zebra_dplane.c

@@ -86,7 +86,7 @@ struct dplane_nexthop_info {
 
 	struct nexthop_group ng;
 	struct nh_grp nh_grp[MULTIPATH_NUM];
-	uint8_t nh_grp_count;
+	uint16_t nh_grp_count;
 };
 
 /*
@@ -2316,7 +2316,7 @@ dplane_ctx_get_nhe_nh_grp(const struct zebra_dplane_ctx *ctx)
 	return ctx->u.rinfo.nhe.nh_grp;
 }
 
-uint8_t dplane_ctx_get_nhe_nh_grp_count(const struct zebra_dplane_ctx *ctx)
+uint16_t dplane_ctx_get_nhe_nh_grp_count(const struct zebra_dplane_ctx *ctx)
 {
 	DPLANE_CTX_VALID(ctx);
 	return ctx->u.rinfo.nhe.nh_grp_count;

zebra/zebra_dplane.h

@@ -597,7 +597,7 @@ const struct nexthop_group *
 dplane_ctx_get_nhe_ng(const struct zebra_dplane_ctx *ctx);
 const struct nh_grp *
 dplane_ctx_get_nhe_nh_grp(const struct zebra_dplane_ctx *ctx);
-uint8_t dplane_ctx_get_nhe_nh_grp_count(const struct zebra_dplane_ctx *ctx);
+uint16_t dplane_ctx_get_nhe_nh_grp_count(const struct zebra_dplane_ctx *ctx);
 
 /* Accessors for LSP information */