Remove an oddly unnecessary temporary.

llvm-svn: 298888
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index 6c148a3..8e159f4 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -1836,8 +1836,7 @@
     PatchPointOpers Opers(&MI);
     return Opers.getNumPatchBytes();
   } else {
-    const MCInstrDesc &Desc = get(Opcode);
-    return Desc.getSize();
+    return get(Opcode).getSize();
   }
 }