Possible NULL de-reference on fullsceen check

Also quiet some other minor warnings

source/blender/editors/physics/particle_edit.c

@@ -420,8 +420,9 @@ static void PE_create_shape_tree(PEData *data, Object *shapeob)
 	
 	memset(&data->shape_bvh, 0, sizeof(data->shape_bvh));
 	
-	if (!shapeob || !shapeob->derivedFinal)
+	if (!dm) {
 		return;
+	}
 	
 	DM_ensure_tessface(dm);
 	bvhtree_from_mesh_faces(&data->shape_bvh, dm, 0.0f, 4, 8);

source/blender/editors/render/render_view.c

@@ -164,7 +164,7 @@ ScrArea *render_view_open(bContext *C, int mx, int my)
 
 		/* if the active screen is already in fullscreen mode, skip this and
 		 * unset the area, so that the fullscreen area is just changed later */
-		if (sa->full) {
+		if (sa && sa->full) {
 			sa = NULL;
 		}
 		else {

source/blender/editors/sculpt_paint/paint_image_proj.c

@@ -3104,6 +3104,9 @@ static void proj_paint_state_viewport_init(ProjPaintState *ps)
 			ps->clipend = params.clipend;
 			ps->is_ortho = params.is_ortho;
 		}
+		else {
+			BLI_assert(0);
+		}
 
 		/* same as #ED_view3d_ob_project_mat_get */
 		mul_m4_m4m4(vmat, viewmat, ps->ob->obmat);

source/blender/editors/space_node/drawnode.c

@@ -390,7 +390,7 @@ static void node_draw_frame_label(bNodeTree *ntree, bNode *node, const float asp
 	float width, ascender;
 	float x, y;
 	const int font_size = data->label_size / aspect;
-	const float margin = NODE_DY / 4;
+	const float margin = (float)(NODE_DY / 4);
 
 	nodeLabel(ntree, node, label, sizeof(label));