Minor API change. No change in functionality.

llvm-svn: 83022
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 885f59c..42f3511 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -2241,7 +2241,7 @@
       // ranking implicit conversion sequences as described in 13.3.3.2, the ambiguous 
       // conversion sequence is treated as a user-defined sequence that is 
       // indistinguishable from any other user-defined conversion sequence
-        if (Candidate.Conversions[ArgIdx].ConversionFunctionSet.size() > 0)
+        if (!Candidate.Conversions[ArgIdx].ConversionFunctionSet.empty())
           Candidate.Conversions[ArgIdx].ConversionKind =
             ImplicitConversionSequence::UserDefinedConversion;
         else {