[yelp] libyelp: Fix some uninitialized variables

[Yosef Or Boczko <yoseforb src gnome org>]

commit 0efbf11ea9d9d66c27c15c0b8bea2a3606d682b6
Author: Yosef Or Boczko <yoseforb src gnome org>
Date:   Thu Jul 16 14:17:52 2015 +0300

    libyelp: Fix some uninitialized variables
    
    This fix errors build with last gcc.

 libyelp/yelp-mallard-document.c |    6 +++---
 libyelp/yelp-view.c             |    4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/libyelp/yelp-mallard-document.c b/libyelp/yelp-mallard-document.c
index 2ed94d8..e42f40b 100644
--- a/libyelp/yelp-mallard-document.c
+++ b/libyelp/yelp-mallard-document.c
@@ -324,8 +324,8 @@ mallard_think (YelpMallardDocument *mallard)
 
     gchar **path;
     gint path_i;
-    GFile *gfile;
-    GFileEnumerator *children;
+    GFile *gfile = NULL;
+    GFileEnumerator *children = NULL;
     GFileInfo *pageinfo;
 
     editor_mode = yelp_settings_get_editor_mode (yelp_settings_get_default ());
@@ -976,7 +976,7 @@ mallard_index_threaded (YelpMallardDocument *mallard)
             xmlXPathContextPtr xpath = NULL;
             xmlXPathObjectPtr obj;
             MallardIndexData *index = NULL;
-            xmlChar *id;
+            xmlChar *id = NULL;
             YelpUri *uri;
             gchar *title, *desc, *fulltext, *tmp, *full_uri;
 
diff --git a/libyelp/yelp-view.c b/libyelp/yelp-view.c
index 47c9126..6783575 100644
--- a/libyelp/yelp-view.c
+++ b/libyelp/yelp-view.c
@@ -1018,7 +1018,7 @@ view_install_uri (YelpView    *view,
     GtkWidget *gtkwin;
     GdkWindow *gdkwin;
     /* do not free */
-    const gchar *pkg, *confirm_search;
+    const gchar *pkg = NULL, *confirm_search;
 
     if (g_str_has_prefix (uri, "install-help:")) {
         help = TRUE;
@@ -2058,7 +2058,7 @@ static gdouble
 get_screen_dpi (GdkScreen *screen)
 {
     GtkSettings *settings = NULL;
-    gdouble dpi;
+    gdouble dpi = -1;
     gdouble dp, di;
 
     settings = gtk_settings_get_for_screen (screen);