[LyX/master] Fix two warnings in BufferView.

[Thibaut Cuvelier]

commit 8ed8d36595617e20d7994346ad54aa0e50b36ec3
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Thu Sep 3 00:37:52 2020 +0200

    Fix two warnings in BufferView.
---
 src/BufferView.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index 75d8a4e..e75bc5e 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -947,7 +947,7 @@ bool BufferView::scrollToCursor(DocIterator const & dit, bool const recenter)
 	TextMetrics & tm = d->text_metrics_[bot.text()];
 
 	pos_type const max_pit = pos_type(bot.text()->paragraphs().size() - 1);
-	int bot_pit = bot.pit();
+	pos_type bot_pit = bot.pit();
 	if (bot_pit > max_pit) {
 		// FIXME: Why does this happen?
 		LYXERR0("bottom pit is greater that max pit: "