Bug 1626776 - Delete redundant return statement at the end of a function with a void return type. r=jgilbert

Differential Revision: https://phabricator.services.mozilla.com/D70144

--HG--
extra : moz-landing-system : lando

dom/canvas/WebGLContextGL.cpp

@@ -817,7 +817,6 @@ void WebGLContext::PixelStorei(GLenum pname, uint32_t param) {
   }
 
   ErrorInvalidEnumInfo("pname", pname);
-  return;
 }
 
 bool WebGLContext::DoReadPixelsAndConvert(