common/cmd_ide.c: fix GCC 4.6 build warnings

Fix:
cmd_ide.c: In function 'ide_ident':
cmd_ide.c:988:6: warning: variable 'do_retry' set but not used
[-Wunused-but-set-variable]

Delete the unused variable.
Signed-off-by: NWolfgang Denk <wd@denx.de>

common/cmd_ide.c

@@ -985,7 +985,6 @@ static void ide_ident(block_dev_desc_t *dev_desc)
 
 #ifdef CONFIG_ATAPI
 	int retries = 0;
-	int do_retry = 0;
 #endif
 
 #ifdef CONFIG_TUNE_PIO
@@ -1007,7 +1006,6 @@ static void ide_ident(block_dev_desc_t *dev_desc)
 	dev_desc->if_type = IF_TYPE_IDE;
 #ifdef CONFIG_ATAPI
 
-	do_retry = 0;
 	retries = 0;
 
 	/* Warning: This will be tricky to read */