board/esd/common/flash.c: Fix compile warning

Fix warning: ../common/flash.c:635: warning: dereferencing type-punned
pointer will break strict-aliasing rules

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Cc: Stefan Roese <sr@denx.de>
Acked-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/board/esd/common/flash.c b/board/esd/common/flash.c
index 3ea053b..38a58fb 100644
--- a/board/esd/common/flash.c
+++ b/board/esd/common/flash.c
@@ -630,9 +630,10 @@
  */
 static int write_word (flash_info_t *info, ulong dest, ulong data)
 {
+	ulong *data_ptr = &data;
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[0]);
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *)dest;
-	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *)&data;
+	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *)data_ptr;
 	ulong start;
 	int flag;
 	int i;