Change ERROR to WARNING to finish fixing bug 11904, comment 3: bug 11856...

Change ERROR to WARNING to finish fixing bug 11904, comment 3: bug 11856 resolved to drop the ERROR regarding no statements after the last label in the switch.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@26479 e7fa87d3-cd2b-0410-9028-fcbf551c1848