clarify comment

Author: dominik-steenken

llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp

@@ -1808,8 +1808,8 @@ unsigned SystemZInstrInfo::getInstSizeInBytes(const MachineInstr &MI) const {
                               .getParent()
                               ->getStackProtectorGuard();
     unsigned Size = (MI.getOpcode() == TargetOpcode::LOAD_STACK_GUARD)
-                        ? 6
-                        : 0; // lg to load value
+                        ? 6 // lg to load value
+                        : 0;
     if (GuardType == "global")
       return Size + 6; // larl/lgrl
     if (GuardType.empty() || GuardType == "tls")