VPP-83: fix collateral damage

Accidentally removed pthread_mutex_unlock (&root_rp->mutex) in the
dead client scan case. Oops. Bad idea.

Change-Id: I488b7e39d01c267052785bd346e8846351db90a9
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vlib-api/vlibmemory/memory_shared.c b/vlib-api/vlibmemory/memory_shared.c
index 71150fd..1684acf 100644
--- a/vlib-api/vlibmemory/memory_shared.c
+++ b/vlib-api/vlibmemory/memory_shared.c
@@ -287,6 +287,7 @@
             /* Clean up the root region client list */
             pthread_mutex_lock (&root_rp->mutex);
             svm_client_scan_this_region_nolock (root_rp);
+            pthread_mutex_unlock (&root_rp->mutex);
         } 
         pthread_mutex_unlock (&vlib_rp->mutex);
         am->vlib_rp = vlib_rp;