tls: avoid double close.

This should fix issue 717441 reported by Coverity.

src/log-tlslog.c

@@ -354,6 +354,7 @@ end_fwrite_fpmeta:
         fclose(fpmeta);
         SCLogWarning(SC_ERR_FWRITE, "Unable to write certificate metafile");
     }
+    SCReturn;
 end_fp:
     fclose(fp);
 }