Fix typo

Change-Id: I7b94fdd366fd8e149ec6e2af458338e6a56b400c
Reviewed-on: https://gerrit.libreoffice.org/71027
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

compilerplugins/clang/useuniqueptr.cxx

@@ -261,7 +261,7 @@ void UseUniquePtr::CheckDeleteExpr(const FunctionDecl* functionDecl, const CXXDe
         // don't always own this
         if (fn == SRCDIR "/editeng/source/editeng/impedit2.cxx")
             return;
-        // this member needs to get passed via a extern "C" API
+        // this member needs to get passed via an extern "C" API
         if (fn == SRCDIR "/sd/source/filter/sdpptwrp.cxx")
             return;
         // ownership complicated between this and the group