fix PR3488: llvm-ar r doesn't replace existing files

Patch by Daniel Shelton!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63870 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index a6611a3..766d91c 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -638,7 +638,7 @@
       const sys::FileStatus *si = PwS.getFileStatus(false, &Err);
       if (!si)
         return true;
-      if (si->isDir) {
+      if (!si->isDir) {
         if (OnlyUpdate) {
           // Replace the item only if it is newer.
           if (si->modTime > I->getModTime())