Nodes Editor + other warning fixes:

* Added 'active node' panel for the Nodes Editor. This panel, in the NKEY region, shows the settings for the active node. Included in this panel is a field used for editing the unique-name of the node too. 

* Fixed a number of uninitialised vars warnings that I missed in previous commit...

source/blender/editors/space_node/node_buttons.c

@@ -49,6 +49,7 @@
 #include "BKE_depsgraph.h"
 #include "BKE_idprop.h"
 #include "BKE_object.h"
+#include "BKE_node.h"
 #include "BKE_global.h"
 #include "BKE_scene.h"
 #include "BKE_screen.h"
@@ -78,7 +79,6 @@
 #define B_NOP		1
 #define B_REDR		2
 
-#if 0 // XXX not used...
 static void do_node_region_buttons(bContext *C, void *arg, int event)
 {
 	//SpaceNode *snode= CTX_wm_space_node(C);
@@ -89,7 +89,44 @@ static void do_node_region_buttons(bContext *C, void *arg, int event)
 		return; /* no notifier! */
 	}
 }
-#endif
+
+/* poll callback for active node */
+static int active_node_poll(const bContext *C, PanelType *pt)
+{
+	SpaceNode *snode= CTX_wm_space_node(C);
+	
+	// TODO: include check for whether there is an active node...
+	return (snode && snode->nodetree);
+}
+
+/* active node */
+static void active_node_panel(const bContext *C, Panel *pa)
+{
+	SpaceNode *snode= CTX_wm_space_node(C);
+	bNodeTree *ntree= (snode) ? snode->nodetree : NULL; // XXX what's up with edittree then?
+	bNode *node = (ntree) ? nodeGetActive(ntree) : NULL;
+	uiLayout *layout= pa->layout;
+	uiBlock *block;
+	PointerRNA ptr;
+	
+	/* verify pointers, and create RNA pointer for the node */
+	if ELEM(NULL, ntree, node)
+		return;
+	RNA_pointer_create(&ntree->id, &RNA_Node, node, &ptr);
+	
+	/* set update callback */
+	// xxx is this really needed
+	block= uiLayoutGetBlock(layout);
+	uiBlockSetHandleFunc(block, do_node_region_buttons, NULL);
+	
+	/* draw this node's name, etc. */
+	uiItemR(layout, NULL, ICON_NODE, &ptr, "name", 0);
+	// TODO: a separator would be nice...
+	
+	/* draw this node's settings */
+	if (node->typeinfo && node->typeinfo->uifunc)
+		node->typeinfo->uifunc(layout, (bContext *)C, &ptr);
+}
 
 /* ******************* node buttons registration ************** */
 
@@ -97,7 +134,12 @@ void node_buttons_register(ARegionType *art)
 {
 	PanelType *pt;
 	
-	// XXX active node
+	pt= MEM_callocN(sizeof(PanelType), "spacetype node panel active node");
+	strcpy(pt->idname, "NODE_PT_item");
+	strcpy(pt->label, "Active Node");
+	pt->draw= active_node_panel;
+	pt->poll= active_node_poll;
+	BLI_addtail(&art->paneltypes, pt);
 	
 	pt= MEM_callocN(sizeof(PanelType), "spacetype node panel gpencil");
 	strcpy(pt->idname, "NODE_PT_gpencil");

source/blender/nodes/intern/CMP_nodes/CMP_levels.c

@@ -50,7 +50,7 @@ static void rgb_tobw(float r, float g, float b, float* out)
 static void fill_bins(bNode* node, CompBuf* in, int* bins)
 {
 	float value[4];
-    int ivalue;
+	int ivalue=0;
 	int x,y;
 
 	/*fill bins */

source/blender/python/intern/bpy_operator.c

@@ -153,7 +153,7 @@ static PyObject *pyop_as_string( PyObject * self, PyObject * args)
 	int all_args = 1;
 	int error_val= 0;
 
-	char *buf;
+	char *buf = NULL;
 	PyObject *pybuf;
 
 	bContext *C = BPy_GetContext();

source/blender/python/intern/bpy_rna.c

@@ -1757,7 +1757,7 @@ static int foreach_compat_buffer(RawPropertyType raw_type, int attr_signed, cons
 static PyObject *foreach_getset(BPy_PropertyRNA *self, PyObject *args, int set)
 {
 	PyObject *item = NULL;
-	int i=0, ok, buffer_is_compat;
+	int i=0, ok=0, buffer_is_compat;
 	void *array= NULL;
 
 	/* get/set both take the same args currently */

source/blender/windowmanager/intern/wm_window.c

@@ -986,3 +986,4 @@ void WM_cursor_warp(wmWindow *win, int x, int y)
 		win->eventstate->prevy= oldy;
 	}
 }
+