Clean up double negative, per Tom Lane.

src/backend/port/dynloader/netbsd.c

@@ -3,7 +3,7 @@
  * Portions Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
  *
- * $PostgreSQL: pgsql/src/backend/port/dynloader/netbsd.c,v 1.23 2008/03/05 19:42:11 alvherre Exp $
+ * $PostgreSQL: pgsql/src/backend/port/dynloader/netbsd.c,v 1.24 2008/03/05 21:14:10 alvherre Exp $
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -99,8 +99,7 @@ BSD44_derived_dlsym(void *handle, const char *name)
 void
 BSD44_derived_dlclose(void *handle)
 {
-#if !defined(HAVE_DLOPEN)
-#else
+#if defined(HAVE_DLOPEN)
 	dlclose(handle);
 #endif
 }