vcl: drop lock on segment attach failure

Type: fix

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I3bc2c7986f492b7b7dfbc84e4893202354223790
diff --git a/src/vcl/vcl_private.c b/src/vcl/vcl_private.c
index 589380d..847e32c 100644
--- a/src/vcl/vcl_private.c
+++ b/src/vcl/vcl_private.c
@@ -435,6 +435,7 @@
   if ((rv = fifo_segment_attach (&vcm->segment_main, a)))
     {
       clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
+      clib_rwlock_writer_unlock (&vcm->segment_table_lock);
       return rv;
     }
   hash_set (vcm->segment_table, segment_handle, a->new_segment_indices[0]);