fib: Fix some more realloc errors

Type: fix

Change-Id: I6011f5d6eae79019d3c16a260a9bedf0a76d2151
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/fib/fib_entry.c b/src/vnet/fib/fib_entry.c
index d8c57fd..3bef28e 100644
--- a/src/vnet/fib/fib_entry.c
+++ b/src/vnet/fib/fib_entry.c
@@ -708,7 +708,7 @@
 {
     fib_entry = fib_entry_post_flag_update_actions(fib_entry,
                                                    old_flags);
-    fib_entry_src_action_installed(fib_entry, source);
+    fib_entry = fib_entry_src_action_installed(fib_entry, source);
 
     return (fib_entry);
 }