[LyX/master] Fix warnings

[Richard Kimberly Heck]

commit f53243f81b31b65e336c8f04e845d38d447177d4
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Fri Feb 28 00:10:23 2020 -0500

    Fix warnings
---
 src/frontends/qt/Dialog.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt/Dialog.cpp b/src/frontends/qt/Dialog.cpp
index 2369738..4dbc2d4 100644
--- a/src/frontends/qt/Dialog.cpp
+++ b/src/frontends/qt/Dialog.cpp
@@ -81,7 +81,7 @@ void Dialog::disconnect() const
 
 bool Dialog::isBufferAvailable() const
 {
-	return lyxview_.currentBufferView() != 0;
+	return lyxview_.currentBufferView() != nullptr;
 }
 
 
@@ -227,7 +227,7 @@ Inset const * Dialog::inset(InsetCode code) const
 	// Check if next is of the type we look for
 	if (next)
 		if (next->lyxCode() != code)
-			next = 0;
+			next = nullptr;
 	if (ins) {
 		// prefer next if it is of the requested type (bug 8716)
 		if (next)