[LyX/master] Remove unneeded std::move

[Jean-Marc Lasgouttes]

commit 44e88a4c1324fed447ab5510734c741d18f856c0
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Thu Jun 6 15:23:42 2019 +0200

    Remove unneeded std::move
    
    Signalled by gcc 9.
---
 src/MetricsInfo.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/MetricsInfo.cpp b/src/MetricsInfo.cpp
index 0e90876..b33c368 100644
--- a/src/MetricsInfo.cpp
+++ b/src/MetricsInfo.cpp
@@ -74,7 +74,7 @@ Changer MetricsBase::changeFontSet(string const & name)
            && ((isTextFont(oldname) && oldcolor != Color_foreground)
                || (isMathFont(oldname) && oldcolor != Color_math)))
                font.setColor(oldcolor);
-       return move(rc);
+       return rc;
 }