[GL/IO] TIN; Fix duplicate if condition.

Original CppCheck message is:
"Same expression on both sides of '&&'.. Finding the same expression on both sides of an operator is suspicious and might indicate a cut and paste or logic error. Please examine this code carefully to determine if it is correct."

DON'T COPY & PASTE!

GeoLib/IO/TINInterface.cpp

@@ -112,7 +112,8 @@ GeoLib::Surface* TINInterface::readTIN(std::string const& fname,
         // create new Triangle
         if (pnt_pos_0 != std::numeric_limits<std::size_t>::max() &&
             pnt_pos_1 != std::numeric_limits<std::size_t>::max() &&
-            pnt_pos_1 != std::numeric_limits<std::size_t>::max()) {
+            pnt_pos_2 != std::numeric_limits<std::size_t>::max())
+        {
             sfc->addTriangle(pnt_pos_0, pnt_pos_1, pnt_pos_2);
         }
     }