follow-up for tinderbox fix

> vcl/opengl/texture.cxx:53:5:
> error: calling static member function through member call syntax,
> use 'TextureState::generate' instead [loplugin:staticcall]

Change-Id: Ie550549fb23b0199014ed41adcc2f3da8c4d1520
Reviewed-on: https://gerrit.libreoffice.org/24544Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
Tested-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>

vcl/opengl/texture.cxx

@@ -50,7 +50,7 @@ ImplOpenGLTexture::ImplOpenGLTexture( int nWidth, int nHeight, bool bAllocate )
     OpenGLVCLContextZone aContextZone;
 
     auto& rState = OpenGLContext::getVCLContext()->state();
-    rState->texture().generate(mnTexture);
+    TextureState::generate(mnTexture);
     rState->texture().active(0);
     rState->texture().bind(mnTexture);
 
@@ -86,7 +86,7 @@ ImplOpenGLTexture::ImplOpenGLTexture( int nX, int nY, int nWidth, int nHeight )
     // nY = GetHeight() - nHeight - nY;
 
     auto& rState = OpenGLContext::getVCLContext()->state();
-    rState->texture().generate(mnTexture);
+    TextureState::generate(mnTexture);
     rState->texture().active(0);
     rState->texture().bind(mnTexture);
 
@@ -116,7 +116,7 @@ ImplOpenGLTexture::ImplOpenGLTexture( int nWidth, int nHeight, int nFormat, int
     OpenGLVCLContextZone aContextZone;
 
     auto& rState = OpenGLContext::getVCLContext()->state();
-    rState->texture().generate(mnTexture);
+    TextureState::generate(mnTexture);
     rState->texture().active(0);
     rState->texture().bind(mnTexture);