webgl: Add correct error handling to BufferSubData

From the WebGL spec:

> If data is null then an INVALID_VALUE error is generated.

1 files changed, 1 insertions, 1 deletions

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 37fc47d9d78..eecfeceee15 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -417,7 +417,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
         }
         let data = match data {
             Some(data) => data,
-            None => return,
+            None => return self.webgl_error(InvalidValue),
         };
         if offset < 0 {
             return self.webgl_error(InvalidValue);