[llvm-mca] Rename an error variable.

llvm-svn: 349662
diff --git a/llvm/tools/llvm-mca/llvm-mca.cpp b/llvm/tools/llvm-mca/llvm-mca.cpp
index 37c997c..68d63db59 100644
--- a/llvm/tools/llvm-mca/llvm-mca.cpp
+++ b/llvm/tools/llvm-mca/llvm-mca.cpp
@@ -339,8 +339,8 @@
   Expected<const mca::CodeRegions &> RegionsOrErr = CRG.parseCodeRegions();
   if (!RegionsOrErr) {
     if (auto Err =
-            handleErrors(RegionsOrErr.takeError(), [](const StringError &Err) {
-              WithColor::error() << Err.getMessage() << '\n';
+            handleErrors(RegionsOrErr.takeError(), [](const StringError &E) {
+              WithColor::error() << E.getMessage() << '\n';
             })) {
       // Default case.
       WithColor::error() << toString(std::move(Err)) << '\n';