Fix typo in #error: IS_IN_NOWHERE vs. IS_NOWHERE

Signed-off-by: Loc Minier <loic.minier@linaro.org>

common/cmd_nvedit.c

@@ -65,7 +65,7 @@ DECLARE_GLOBAL_DATA_PTR;
     !defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
     !defined(CONFIG_ENV_IS_NOWHERE)
 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
-SPI_FLASH|MG_DISK|NVRAM|MMC|NOWHERE}
+SPI_FLASH|MG_DISK|NVRAM|MMC} or CONFIG_ENV_IS_NOWHERE
 #endif
 
 #define XMK_STR(x)	#x