[LyX/master] Fix a few warnings.

[Thibaut Cuvelier]

commit 594a4763b784edeaa96f875673dd3b5b4742ffc7
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Wed Sep 2 00:00:54 2020 +0200

    Fix a few warnings.
---
 src/Paragraph.cpp           |    4 ++--
 src/insets/InsetNewline.cpp |    2 +-
 src/output_docbook.cpp      |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Paragraph.cpp b/src/Paragraph.cpp
index 9dea24b..a409d20 100644
--- a/src/Paragraph.cpp
+++ b/src/Paragraph.cpp
@@ -3860,8 +3860,8 @@ bool Paragraph::isHardHyphenOrApostrophe(pos_type pos) const
 	char_type const c = d->text_[pos];
 	if (c != '-' && c != '\'')
 		return false;
-	int nextpos = pos + 1;
-	int prevpos = pos > 0 ? pos - 1 : 0;
+	pos_type nextpos = pos + 1;
+	pos_type prevpos = pos > 0 ? pos - 1 : 0;
 	if ((nextpos == psize || isSpace(nextpos))
 		&& (pos == 0 || isSpace(prevpos)))
 		return false;
diff --git a/src/insets/InsetNewline.cpp b/src/insets/InsetNewline.cpp
index b33cf00..4c6f17e 100644
--- a/src/insets/InsetNewline.cpp
+++ b/src/insets/InsetNewline.cpp
@@ -172,7 +172,7 @@ int InsetNewline::plaintext(odocstringstream & os,
 }
 
 
-void InsetNewline::docbook(XMLStream & xs, OutputParams const & runparams) const
+void InsetNewline::docbook(XMLStream &, OutputParams const &) const
 {
 	// New lines are handled by Paragraph::simpleDocBookOnePar.
 }
diff --git a/src/output_docbook.cpp b/src/output_docbook.cpp
index 1f17351..087d5a9 100644
--- a/src/output_docbook.cpp
+++ b/src/output_docbook.cpp
@@ -471,7 +471,7 @@ void makeParagraph(
 	// Plain layouts must be ignored.
 	special_case |= buf.params().documentClass().isPlainLayout(par->layout()) && !runparams.docbook_force_pars;
 	// Equations do not deserve their own paragraph (DocBook allows them outside paragraphs).
-	special_case |= nInsets == par->size() && std::all_of(par->insetList().begin(), par->insetList().end(), [](InsetList::Element inset) {
+	special_case |= nInsets == (size_t) par->size() && std::all_of(par->insetList().begin(), par->insetList().end(), [](InsetList::Element inset) {
 		return inset.inset && inset.inset->asInsetMath();
 	});