dump: fix memory_mapping_filter leak

Spotted by ASAN.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/memory_mapping.c b/memory_mapping.c
index 6a39d71..a5d3855 100644
--- a/memory_mapping.c
+++ b/memory_mapping.c
@@ -337,6 +337,7 @@
         if (cur->phys_addr >= begin + length ||
             cur->phys_addr + cur->length <= begin) {
             QTAILQ_REMOVE(&list->head, cur, next);
+            g_free(cur);
             list->num--;
             continue;
         }