Fix a missing check from my last commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94949 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index e27d93c..e272d9b 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2270,7 +2270,8 @@
     return false;
   // If it's an indirect call, conversatively return false if the caller's
   // address is taken.
-  if (!isa<ExternalSymbolSDNode>(Callee) && CallerF->hasAddressTaken())
+  if (!CalleeF &&
+      !isa<ExternalSymbolSDNode>(Callee) && CallerF->hasAddressTaken())
     return false;
 
   // Look for obvious safe cases to perform tail call optimization.