Fix pessimising moves.

llvm-svn: 297928
diff --git a/llvm/lib/Support/CachePruning.cpp b/llvm/lib/Support/CachePruning.cpp
index 73e55f2..5d81e10 100644
--- a/llvm/lib/Support/CachePruning.cpp
+++ b/llvm/lib/Support/CachePruning.cpp
@@ -71,12 +71,12 @@
     if (Key == "prune_interval") {
       auto DurationOrErr = parseDuration(Value);
       if (!DurationOrErr)
-        return std::move(DurationOrErr.takeError());
+        return DurationOrErr.takeError();
       Policy.Interval = *DurationOrErr;
     } else if (Key == "prune_after") {
       auto DurationOrErr = parseDuration(Value);
       if (!DurationOrErr)
-        return std::move(DurationOrErr.takeError());
+        return DurationOrErr.takeError();
       Policy.Expiration = *DurationOrErr;
     } else if (Key == "cache_size") {
       if (Value.back() != '%')