pbrd: delete pbr nhg cache after rlease from hash

Actually delete the allocated pbr_nhg_cache object we just
released.

Found via memory leak:

==3078405== 136 bytes in 1 blocks are definitely lost in loss record 8,282 of 8,802
==3078405==    at 0x483BB1A: calloc (vg_replace_malloc.c:762)
==3078405==    by 0x48E35E8: qcalloc (memory.c:110)
==3078405==    by 0x40EBA7: pbr_nhgc_alloc (pbr_nht.c:194)
==3078405==    by 0x48CC0EB: hash_get (hash.c:148)
==3078405==    by 0x40F825: pbr_nht_add_individual_nexthop (pbr_nht.c:534)
==3078405==    by 0x409853: pbr_map_nexthop_magic (pbr_vty.c:400)
==3078405==    by 0x4093F1: pbr_map_nexthop (pbr_vty_clippy.c:417)
==3078405==    by 0x48ACF72: cmd_execute_command_real (command.c:1073)
==3078405==    by 0x48ACB3B: cmd_execute_command (command.c:1133)
==3078405==    by 0x48AD063: cmd_execute (command.c:1288)
==3078405==    by 0x493D8EE: vty_command (vty.c:526)
==3078405==    by 0x493D397: vty_execute (vty.c:1293)

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>

0 files changed, 0 insertions, 0 deletions