mesa: Drop the "target" parameter from NewBufferObject().

NewBufferObject took a "target" parameter, which it blindly passed to
_mesa_initialize_buffer_object(), which ignored it.

Not much point in passing it around.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/main/shared.c

@@ -86,7 +86,7 @@ _mesa_alloc_shared_state(struct gl_context *ctx)
    shared->SamplerObjects = _mesa_NewHashTable();
 
    /* Allocate the default buffer object */
-   shared->NullBufferObj = ctx->Driver.NewBufferObject(ctx, 0, 0);
+   shared->NullBufferObj = ctx->Driver.NewBufferObject(ctx, 0);
 
    /* Create default texture objects */
    for (i = 0; i < NUM_TEXTURE_TARGETS; i++) {