fix for bug #1634 '"operator new" in my_new wastes memory'

BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -48,6 +48,7 @@ jcole@sarvik.tfr.cafe.ee
 jcole@tetra.spaceapes.com
 jorge@linux.jorge.mysql.com
 kaj@work.mysql.com
+konstantin@mysql.com
 kostja@oak.local
 lenz@kallisto.mysql.com
 lenz@mysql.com

mysys/my_new.cc

@@ -25,12 +25,12 @@
 
 void *operator new (size_t sz)
 {
-  return (void *) malloc (sz ? sz+1 : sz);
+  return (void *) malloc (sz ? sz : 1);
 }
 
 void *operator new[] (size_t sz)
 {
-  return (void *) malloc (sz ? sz+1 : sz);
+  return (void *) malloc (sz ? sz : 1);
 }
 
 void operator delete (void *ptr)