Missing “if (log)” on a log printf.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@168602 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Expression/IRForTarget.cpp b/source/Expression/IRForTarget.cpp
index 967b2c4..ef76b9d 100644
--- a/source/Expression/IRForTarget.cpp
+++ b/source/Expression/IRForTarget.cpp
@@ -2679,9 +2679,10 @@
 
         GlobalValue::use_iterator ui = global_var->use_begin();
         
-        log->Printf("Couldn't remove %s because of %s",
-                    PrintValue(global_var).c_str(),
-                    PrintValue(*ui).c_str());
+        if (log)
+            log->Printf("Couldn't remove %s because of %s",
+                        PrintValue(global_var).c_str(),
+                        PrintValue(*ui).c_str());
     }
     
     return true;