etnaviv: fix compile warnings

Fixes: e5cc66df ("etnaviv: Rework locking")
Fixes: 1456aa61

 ("etnaviv: Rework resource status tracking")
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Jonathan Marek <jonathan@marek.ca>

src/gallium/drivers/etnaviv/etnaviv_context.c

@@ -61,7 +61,6 @@ static void
 etna_context_destroy(struct pipe_context *pctx)
 {
    struct etna_context *ctx = etna_context(pctx);
-   struct etna_screen *screen = ctx->screen;
 
    mtx_lock(&ctx->lock);
    if (ctx->used_resources_read) {
@@ -434,7 +433,6 @@ etna_flush(struct pipe_context *pctx, struct pipe_fence_handle **fence,
            enum pipe_flush_flags flags)
 {
    struct etna_context *ctx = etna_context(pctx);
-   struct etna_screen *screen = ctx->screen;
    int out_fence_fd = -1;
 
    mtx_lock(&ctx->lock);

src/gallium/drivers/etnaviv/etnaviv_resource.c

@@ -612,7 +612,6 @@ etna_resource_get_status(struct etna_context *ctx, struct etna_resource *rsc)
 
    set_foreach(rsc->pending_ctx, entry) {
       struct etna_context *extctx = (struct etna_context *)entry->key;
-      struct pipe_context *pctx = &extctx->base;
 
       set_foreach(extctx->used_resources_read, entry2) {
          struct etna_resource *rsc2 = (struct etna_resource *)entry2->key;
@@ -638,7 +637,6 @@ void
 etna_resource_used(struct etna_context *ctx, struct pipe_resource *prsc,
                    enum etna_resource_status status)
 {
-   struct etna_screen *screen = ctx->screen;
    struct pipe_resource *referenced = NULL;
    struct etna_resource *rsc;
 
@@ -649,8 +647,6 @@ etna_resource_used(struct etna_context *ctx, struct pipe_resource *prsc,
 
    rsc = etna_resource(prsc);
 
-   enum etna_resource_status newstatus = 0;
-
    set_foreach(rsc->pending_ctx, entry) {
       struct etna_context *extctx = (struct etna_context *)entry->key;
       struct pipe_context *pctx = &extctx->base;

src/gallium/drivers/etnaviv/etnaviv_transfer.c

@@ -346,7 +346,6 @@ etna_transfer_map(struct pipe_context *pctx, struct pipe_resource *prsc,
     * transfers without a temporary resource.
     */
    if (trans->rsc || !(usage & PIPE_TRANSFER_UNSYNCHRONIZED)) {
-      struct etna_screen *screen = ctx->screen;
       uint32_t prep_flags = 0;
 
       /*