[LyX/master] Fix cppcheck portability warning

[Georg Baum]

commit c3cdd9aea7f8482d709c757017062bff559033ae
Author: Georg Baum <b...@lyx.org>
Date:   Mon Sep 28 20:40:56 2015 +0200

    Fix cppcheck portability warning
    
    (portability) Assigning a pointer to an integer is not portable.

diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index 32a9a98..5148e75 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -1821,7 +1821,7 @@ bool GuiView::getStatus(FuncRequest const & cmd, 
FuncStatus & flag)
                break;
 
        case LFUN_BUFFER_CHILD_OPEN:
-               enable = doc_buffer;
+               enable = doc_buffer != 0;
                break;
 
        case LFUN_BUFFER_WRITE:
@@ -1849,12 +1849,12 @@ bool GuiView::getStatus(FuncRequest const & cmd, 
FuncStatus & flag)
 
        case LFUN_BUFFER_WRITE_AS:
        case LFUN_BUFFER_EXPORT_AS:
-               enable = doc_buffer;
+               enable = doc_buffer != 0;
                break;
 
        case LFUN_BUFFER_CLOSE:
        case LFUN_VIEW_CLOSE:
-               enable = doc_buffer;
+               enable = doc_buffer != 0;
                break;
 
        case LFUN_BUFFER_CLOSE_ALL:
@@ -1888,7 +1888,7 @@ bool GuiView::getStatus(FuncRequest const & cmd, 
FuncStatus & flag)
        }
 
        case LFUN_DROP_LAYOUTS_CHOICE:
-               enable = buf;
+               enable = buf != 0;
                break;
 
        case LFUN_UI_TOGGLE:
@@ -1988,7 +1988,7 @@ bool GuiView::getStatus(FuncRequest const & cmd, 
FuncStatus & flag)
                break;
 
        case LFUN_BUFFER_ZOOM_IN:
-               enable = doc_buffer;
+               enable = doc_buffer != 0;
                break;
 
        case LFUN_BUFFER_MOVE_NEXT: