[LyX/master] Use a reference

[Richard Kimberly Heck]

commit 5333998570902b22c3db30af63ddbe8d91304310
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sat Mar 14 18:05:49 2020 -0400

    Use a reference
---
 src/LaTeXFeatures.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/LaTeXFeatures.cpp b/src/LaTeXFeatures.cpp
index a1190e0..0216182 100644
--- a/src/LaTeXFeatures.cpp
+++ b/src/LaTeXFeatures.cpp
@@ -880,7 +880,7 @@ void LaTeXFeatures::useFloat(string const & name, bool subfloat)
 			require("float");
 		if (!fl.required().empty()) {
 			vector<string> reqs = getVectorFromString(fl.required());
-			for (auto const req : reqs)
+			for (auto const & req : reqs)
 				require(req);
 		}
 	}