Fixed #2301: Vertex layout leak.
Fixed #2301: Vertex layout leak.

LWJGL-CI/bgfx,emoon/bgfx,LWJGL-CI/bgfx,emoon/bgfx,bkaradzic/bgfx,jdryg/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,jdryg/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,jdryg/bgfx,bkaradzic/bgfx,emoon/bgfx