Tweak new PQExpBufferBroken macro to suppress warnings from pickier

versions of gcc.

diff --git a/src/interfaces/libpq/pqexpbuffer.h b/src/interfaces/libpq/pqexpbuffer.h
index 6c3705b49e2c348f120dec1c95d07f00d74780b5..66e0724649ef26cf3e1fbac296f2ca4ff08db21a 100644 (file)
--- a/src/interfaces/libpq/pqexpbuffer.h
+++ b/src/interfaces/libpq/pqexpbuffer.h
@@ -57,7 +57,7 @@ typedef PQExpBufferData *PQExpBuffer;
  *------------------------
  */
 #define PQExpBufferBroken(str)  \
-       (!(str) || (str)->maxlen == 0)
+       ((str) == NULL || (str)->maxlen == 0)
 
 /*------------------------
  * Initial size of the data buffer in a PQExpBuffer.