pvs-studio: (V522) Prevent possible null-pointer dereference in RemoveRPathELF

.pvsconfig

@@ -6,8 +6,6 @@
 //-V::508
 # The 'x' variable is assigned values twice successively. Perhaps this is a mistake.
 //-V::519
-# Possible null pointer dereference.
-//-V::522
 # Constant value is represented by an octal form.
 //-V::536
 # Iterators are passed as arguments to 'Foo' function. Consider inspecting the expression.

Source/cmSystemTools.cxx

@@ -3889,7 +3889,8 @@ static cm::optional<bool> RemoveRPathELF(std::string const& file,
       // There is no RPATH or RUNPATH anyway.
       return true;
     }
-    if (se_count == 2 && se[1]->IndexInSection < se[0]->IndexInSection) {
+    if (se_count == 2 && se[0] && se[1] &&
+        se[1]->IndexInSection < se[0]->IndexInSection) {
       std::swap(se[0], se[1]);
     }