nouveau: return nouveau_screen from hw-specific creation functions

Kills off a void cast.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Tested-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/gallium/drivers/nouveau/nouveau_winsys.h

@@ -79,13 +79,13 @@ nouveau_screen_transfer_flags(unsigned pipe)
    return flags;
 }
 
-extern struct pipe_screen *
+extern struct nouveau_screen *
 nv30_screen_create(struct nouveau_device *);
 
-extern struct pipe_screen *
+extern struct nouveau_screen *
 nv50_screen_create(struct nouveau_device *);
 
-extern struct pipe_screen *
+extern struct nouveau_screen *
 nvc0_screen_create(struct nouveau_device *);
 
 #endif

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -417,7 +417,7 @@ nv30_screen_destroy(struct pipe_screen *pscreen)
       return NULL;                                    \
    } while(0)
 
-struct pipe_screen *
+struct nouveau_screen *
 nv30_screen_create(struct nouveau_device *dev)
 {
    struct nv30_screen *screen = CALLOC_STRUCT(nv30_screen);
@@ -693,5 +693,5 @@ nv30_screen_create(struct nouveau_device *dev)
    nouveau_pushbuf_kick(push, push->channel);
 
    nouveau_fence_new(&screen->base, &screen->base.fence.current, false);
-   return pscreen;
+   return &screen->base;
 }

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -752,7 +752,7 @@ int nv50_tls_realloc(struct nv50_screen *screen, unsigned tls_space)
    return 1;
 }
 
-struct pipe_screen *
+struct nouveau_screen *
 nv50_screen_create(struct nouveau_device *dev)
 {
    struct nv50_screen *screen;
@@ -966,7 +966,7 @@ nv50_screen_create(struct nouveau_device *dev)
 
    nouveau_fence_new(&screen->base, &screen->base.fence.current, false);
 
-   return pscreen;
+   return &screen->base;
 
 fail:
    nv50_screen_destroy(pscreen);

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -622,7 +622,7 @@ nvc0_screen_resize_tls_area(struct nvc0_screen *screen,
       return NULL;                                    \
    } while(0)
 
-struct pipe_screen *
+struct nouveau_screen *
 nvc0_screen_create(struct nouveau_device *dev)
 {
    struct nvc0_screen *screen;
@@ -1063,7 +1063,7 @@ nvc0_screen_create(struct nouveau_device *dev)
 
    nouveau_fence_new(&screen->base, &screen->base.fence.current, false);
 
-   return pscreen;
+   return &screen->base;
 
 fail:
    nvc0_screen_destroy(pscreen);

src/gallium/winsys/nouveau/drm/nouveau_drm_winsys.c

@@ -58,7 +58,7 @@ PUBLIC struct pipe_screen *
 nouveau_drm_screen_create(int fd)
 {
 	struct nouveau_device *dev = NULL;
-	struct pipe_screen *(*init)(struct nouveau_device *);
+	struct nouveau_screen *(*init)(struct nouveau_device *);
 	struct nouveau_screen *screen;
 	int ret, dupfd = -1;
 
@@ -116,7 +116,7 @@ nouveau_drm_screen_create(int fd)
 		goto err;
 	}
 
-	screen = (struct nouveau_screen*)init(dev);
+	screen = init(dev);
 	if (!screen)
 		goto err;