[LyX/master] Fix compiler warning from clang 3.9

[Jean-Marc Lasgouttes]

commit fbba865d288d98a71c37a17458c5e02143392d9a
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Thu Oct 20 09:27:12 2016 +0200

    Fix compiler warning from clang 3.9
---
 src/frontends/qt4/GuiProgressView.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt4/GuiProgressView.cpp 
b/src/frontends/qt4/GuiProgressView.cpp
index 166eed7..335ae1a 100644
--- a/src/frontends/qt4/GuiProgressView.cpp
+++ b/src/frontends/qt4/GuiProgressView.cpp
@@ -152,7 +152,7 @@ void GuiProgressView::debugMessageActivated(QTreeWidgetItem 
* item, int)
 
 void GuiProgressView::levelChanged()
 {
-       int level = Debug::NONE;
+       unsigned int level = Debug::NONE;
        QTreeWidgetItemIterator it(widget_->debugMessagesTW);
        while (*it) {
                if ((*it)->text(1) == qt_("Yes"))
@@ -165,7 +165,7 @@ void GuiProgressView::levelChanged()
 
 void GuiProgressView::debugSelectionChanged()
 {
-       int level = Debug::NONE;
+       unsigned int level = Debug::NONE;
        if (widget_->debugAnyRB->isChecked())
                level = Debug::ANY;
        else if (widget_->debugSelectedRB->isChecked()) {