env: Drop unused env_ptr variables

This variable is declared as a global in most environment location
drivers. But it is not used outside the drivers and most of the
declarations are unnecessary.

Also some drivers call free() on env_ptr which seems wrong since it is
not in the heap.

Drop the variable where possible, and all calls to free().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

env/dataflash.c

@@ -14,8 +14,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-env_t *env_ptr;
-
 static unsigned char env_dataflash_get_char(int index)
 {
 	uchar c;

env/eeprom.c

@@ -21,8 +21,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-env_t *env_ptr;
-
 static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
 			   uchar *buffer, unsigned cnt)
 {
@@ -196,8 +194,6 @@ static int env_eeprom_save(void)
 	char flag_obsolete	= OBSOLETE_FLAG;
 #endif
 
-	BUG_ON(env_ptr != NULL);
-
 	rc = env_export(&env_new);
 	if (rc)
 		return rc;

env/ext4.c

@@ -31,8 +31,6 @@
 #include <ext4fs.h>
 #include <mmc.h>
 
-env_t *env_ptr;
-
 DECLARE_GLOBAL_DATA_PTR;
 
 #ifdef CONFIG_CMD_SAVEENV

env/fat.c

@@ -31,8 +31,6 @@
 # endif
 #endif
 
-env_t *env_ptr;
-
 DECLARE_GLOBAL_DATA_PTR;
 
 #ifdef CMD_SAVEENV

env/mmc.c

@@ -23,12 +23,6 @@
 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
 #endif
 
-#ifdef ENV_IS_EMBEDDED
-env_t *env_ptr = &environment;
-#else /* ! ENV_IS_EMBEDDED */
-env_t *env_ptr;
-#endif /* ENV_IS_EMBEDDED */
-
 DECLARE_GLOBAL_DATA_PTR;
 
 #if !defined(CONFIG_ENV_OFFSET)

env/nowhere.c

@@ -15,8 +15,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-env_t *env_ptr;
-
 U_BOOT_ENV_LOCATION(nowhere) = {
 	.location	= ENVL_NOWHERE,
 	ENV_NAME("nowhere")

env/nvram.c

@@ -36,7 +36,6 @@ DECLARE_GLOBAL_DATA_PTR;
 #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
 extern void *nvram_read(void *dest, const long src, size_t count);
 extern void nvram_write(long dest, const void *src, size_t count);
-env_t *env_ptr;
 #else
 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
 #endif

env/ubi.c

@@ -16,8 +16,6 @@
 #include <ubi_uboot.h>
 #undef crc32
 
-env_t *env_ptr;
-
 DECLARE_GLOBAL_DATA_PTR;
 
 #ifdef CONFIG_CMD_SAVEENV