SourceKit: silence as -Wmisleading-indent warning (NFCI)

Undent the code that was mis-indended leading to a warning with clang.

Author: compnerd

tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp

@@ -1208,8 +1208,8 @@ class CursorRangeInfoConsumer : public SwiftASTConsumer {
     ImmutableTextSnapshotRef InputSnap;
     if (auto EditorDoc = Lang.getEditorDocuments()->findByPath(InputFile))
       InputSnap = EditorDoc->getLatestSnapshot();
-      if (!InputSnap)
-        return false;
+    if (!InputSnap)
+      return false;
 
     auto mappedBackOffset = [&]()->llvm::Optional<unsigned> {
       for (auto &Snap : Snapshots) {