Fixed a couple places that missed the error check for #else/#elif after #else.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24378 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/cppNest.vert

@@ -134,3 +134,39 @@ sum += 600000.0;
         #endif
     #endif
 #endif
+
+// ERROR cases...
+
+#if 0
+int;
+#else
+int;
+#elif 1
+int;
+#endif
+
+#if 0
+int;
+#else
+int;
+#else
+int;
+#endif
+
+#if 0
+    #if 0
+    int;
+    #else
+    int;
+    #elif 1
+    int;
+    #endif
+
+    #if 0
+    int;
+    #else
+    int;
+    #else
+    int;
+    #endif
+#endif