[U-Boot] [PATCHv2] dlmalloc.c: Fix gcc alias warning

[Joakim Tjernlund]

Fix these warnings:
dlmalloc.c: In function 'free':
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break strict-aliasing rules
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break strict-aliasing rules
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break strict-aliasing rules

Some page(http://blog.worldofcoding.com/2010/02/solving-gcc-44-strict-aliasing-problems.html)
suggests adding __attribute__((__may_alias__)). Doing so makes the warnings go away.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund at transmode.se>
---
 - forgot signoff
 - removed stray attribute change

 common/dlmalloc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index 2276532..77420db 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1155,7 +1155,7 @@ struct malloc_chunk
   INTERNAL_SIZE_T size;      /* Size in bytes, including overhead. */
   struct malloc_chunk* fd;   /* double links -- used only if free. */
   struct malloc_chunk* bk;
-};
+} __attribute__((__may_alias__)) ;
 
 typedef struct malloc_chunk* mchunkptr;
 
-- 
1.7.2.2