net/ixgbe: fix build with gcc 4.8.5

Build error:
  In function ‘ixgbe_recv_pkts_lro_bulk_alloc’:
../drivers/net/ixgbe/ixgbe_rxtx.c:2209:24:
  error: ‘next_sc_entry’ may be used uninitialized in this function
  [-Werror=maybe-uninitialized]
    next_sc_entry->fbuf = first_seg;
                        ^
http://mails.dpdk.org/archives/test-report/2020-January/113891.html

This is a compiler false positive and error not seen by newer compilers,
or clang but to fix the warning initializing the complained variable.

According git bisect, no idea how:
Fixes: ad43b7bce95b ("net/ixgbe: avoid multiple definitions of bool")

Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Tested-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index f41dc13..03c0083 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -2028,7 +2028,7 @@ ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts,
                bool eop;
                struct ixgbe_rx_entry *rxe;
                struct ixgbe_scattered_rx_entry *sc_entry;
-               struct ixgbe_scattered_rx_entry *next_sc_entry;
+               struct ixgbe_scattered_rx_entry *next_sc_entry = NULL;
                struct ixgbe_rx_entry *next_rxe = NULL;
                struct rte_mbuf *first_seg;
                struct rte_mbuf *rxm;