Remove unused variable

Author: arsenm

llvm/lib/Target/M68k/M68kFrameLowering.cpp

@@ -246,7 +246,6 @@ MachineBasicBlock::iterator M68kFrameLowering::eliminateCallFramePseudoInstr(
     unsigned StackAlign = getStackAlignment();
     Amount = alignTo(Amount, StackAlign);
 
-    const auto &Fn = MF.getFunction();
     bool DwarfCFI = MF.needsFrameMoves();
 
     // If we have any exception handlers in this function, and we adjust