Fix gcc-4.2 warning on a string that cannot be NULL.

Pointed out by Andrew Sackville-West.


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@16549 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/TransLog.c

@@ -273,7 +273,8 @@ xaccTransWriteLog (Transaction *trans, char flag)
                gnc_numeric_denom(amt),
                gnc_numeric_num(val), 
                gnc_numeric_denom(val),
-               drecn ? drecn : "");
+	       /* The next string always exists. No need to test it. */
+               drecn);
    }
 
    fprintf (trans_log, "===== END\n");