[ELF][ARM] Fix -Werror buildbots NFC.

Provide a missing initializer to get rid of warning provoking buildbot
failures.

error: missing field 'rel' initializer
[-Werror,-Wmissing-field-initializers]



git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@371970 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/ARMErrataFix.cpp b/ELF/ARMErrataFix.cpp
index 7e7903b..493fafc 100644
--- a/ELF/ARMErrataFix.cpp
+++ b/ELF/ARMErrataFix.cpp
@@ -250,7 +250,7 @@
   if (off >= limit || limit - off < 8) {
     // Need at least 2 4-byte sized instructions to trigger erratum.
     off = limit;
-    return {0, 0};
+    return {0, 0, nullptr};
   }
 
   ScanResult scanRes = {0, 0, nullptr};