Revert "renderer: check for shader_text validity"

This reverts commit 3193c2cbab.

This commit broke all shaders.

Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>

src/vrend_renderer.c

@@ -2929,9 +2929,6 @@ int vrend_create_shader(struct vrend_context *ctx,
    bool finished = false;
    int ret;
 
-   if (pkt_length == 0 || shd_text[pkt_length - 1] != '\0')
-      return EINVAL;
-
    if (type > PIPE_SHADER_COMPUTE)
       return EINVAL;