[LyX/master] Indicate that we do not use a return value

[Jean-Marc Lasgouttes]

commit 4828dfb441775d00e5f7ebcb38544405bc713980
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Fri Mar 5 13:12:58 2021 +0100

    Indicate that we do not use a return value
    
    Please Coverity.
---
 src/lyxfind.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/lyxfind.cpp b/src/lyxfind.cpp
index 2d6aea0..09bfead 100644
--- a/src/lyxfind.cpp
+++ b/src/lyxfind.cpp
@@ -3328,7 +3328,7 @@ MatchStringAdv::MatchStringAdv(lyx::Buffer & buf, FindAndReplaceOptions & opt)
 		string lead_as_regexp;
 		if (lead_size > 0) {
 			lead_as_regexp = string2regex(par_as_string.substr(0, lead_size));
-			regex_replace(par_as_string_nolead, par_as_string_nolead, "}$", "");
+			(void)regex_replace(par_as_string_nolead, par_as_string_nolead, "}$", "");
 			par_as_string = par_as_string_nolead;
 			LYXERR(Debug::FIND, "lead_as_regexp is '" << lead_as_regexp << "'");
 			LYXERR(Debug::FIND, "par_as_string now is '" << par_as_string << "'");