Fix warnings and bug spotted by gcc-4.3.

Related to operator precedence and associativity.
Make the expressions as explicit as possible.

sql/field.h:
  Silence gcc-4.3 warning: be more explicit.
sql/item.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/item_sum.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/log_event.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/spatial.h:
  Silence gcc-4.3 warning: be more explicit.
sql/sql_lex.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/table.h:
  Silence gcc-4.3 warning: be more explicit.
storage/federated/ha_federated.cc:
  Fix operator precedence bug.
storage/heap/ha_heap.cc:
  Silence gcc-4.3 warning: be more explicit.

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/field.h b/sql/field.h
index 81905cc64ae..23033e6cc7a 100644
--- a/sql/field.h
+++ b/sql/field.h
@@ -209,7 +209,7 @@ public:
     memcpy(ptr, ptr + l_offset, pack_length());
     if (null_ptr)
       *null_ptr= ((*null_ptr & (uchar) ~null_bit) |
-		  null_ptr[l_offset] & null_bit);
+		  (null_ptr[l_offset] & null_bit));
   }
   virtual bool binary() const { return 1; }
   virtual bool zero_pack() const { return 1; }