exit crash fix

la_tns_kernel.c

@@ -501,7 +501,7 @@ int tnsEnableShaderv(tnsShader *shader){
 void tnsUseShader(tnsShader *shader){
     T->StateShader = shader;
 }
-void tnsDeleteShaderProgram(tnsShader* s){
+void tnsDeleteShaderProgram(tnsShader* s){ if(!s) return;
     tnsUseShader(0); tnsEnableShaderv(0);
     if(s->vtShaderID>-1) glDeleteShader(s->vtShaderID);
     if(s->fgShaderID>-1) glDeleteShader(s->fgShaderID);