cave: add missing braces for scoping

This had never been noticed as it only effects the status message.  This was
identified by the new GCC warning (-Wmisleading-indentation).

  src/clients/cave/cmd_generate_metadata.cc:264:17: warning: statement is indented as if it were guarded by... [-Wmisleading-indentation]
                   display_callback(DoneOne());
                   ^~~~~~~~~~~~~~~~
  src/clients/cave/cmd_generate_metadata.cc:246:13: note: ...this 'for' clause, but it is not
               for (PackageID::MetadataConstIterator m(id->begin_metadata()), m_end(id->end_metadata()); m_end != m; ++m)
               ^~~

1 files changed, 2 insertions, 0 deletions

diff --git a/src/clients/cave/cmd_generate_metadata.cc b/src/clients/cave/cmd_generate_metadata.cc
index b3425f87d..955a328bf 100644
--- a/src/clients/cave/cmd_generate_metadata.cc
+++ b/src/clients/cave/cmd_generate_metadata.cc
@@ -244,6 +244,7 @@ namespace
                 return;
 
             for (PackageID::MetadataConstIterator m(id->begin_metadata()), m_end(id->end_metadata()); m_end != m; ++m)
+            {
                 try
                 {
                     MetadataVisitor v;
@@ -262,6 +263,7 @@ namespace
                 }
 
                 display_callback(DoneOne());
+            }
         }
     }
 }