[PATCH] include/eeprom.h: fix build errors

[Rasmus Villemoes]

CMD_EEPROM and ENV_IS_IN_EEPROM can be selected independently, and
cmd/eeprom.o gets built in either case, so whether to declare the real
prototypes needs to follow the same logic as whether cmd/eeprom.c is
built. Otherwise a ENV_IS_IN_EEPROM=y, CMD_EEPROM=n build fails

cmd/eeprom.c:73:1: error: expected identifier or ‘(’ before ‘{’ token
 {

While at it, fix the dummy replacements (at least assuming they are
meant to allow the code to compile) - they need to have the same type
as the expression they replace, or one gets errors such as

env/eeprom.c: In function ‘eeprom_bus_read’:
env/eeprom.c:37:8: error: void value not ignored as it ought to be
  rcode = eeprom_read(dev_addr, offset, buffer, cnt);

Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
 include/eeprom.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/eeprom.h b/include/eeprom.h
index 79118eb83d..6820844cea 100644
--- a/include/eeprom.h
+++ b/include/eeprom.h
@@ -7,7 +7,7 @@
 #ifndef __EEPROM_LEGACY_H
 #define __EEPROM_LEGACY_H
 
-#ifdef CONFIG_CMD_EEPROM
+#if defined(CONFIG_CMD_EEPROM) || defined(CONFIG_ENV_IS_IN_EEPROM)
 void eeprom_init(int bus);
 int eeprom_read(uint dev_addr, uint offset, uchar *buffer, uint cnt);
 int eeprom_write(uint dev_addr, uint offset, uchar *buffer, uint cnt);
@@ -17,8 +17,8 @@ int eeprom_write(uint dev_addr, uint offset, uchar *buffer, uint cnt);
  * some macros here so we don't have to touch every one of those uses
  */
 #define eeprom_init(bus)
-#define eeprom_read(dev_addr, offset, buffer, cnt) ((void)-ENOSYS)
-#define eeprom_write(dev_addr, offset, buffer, cnt) ((void)-ENOSYS)
+#define eeprom_read(dev_addr, offset, buffer, cnt) (-ENOSYS)
+#define eeprom_write(dev_addr, offset, buffer, cnt) (-ENOSYS)
 #endif
 
 #if !defined(CONFIG_ENV_EEPROM_IS_ON_I2C) && defined(CONFIG_SYS_I2C_EEPROM_ADDR)
-- 
2.23.0