[U-Boot] [PATCH v4 1/3] env: correct the check of env_flags_validate presence

[Patrick Delaunay <patrick.delaunay@st.com>]

This patch corrects the check of env_flags_validate presence because
"flags.c" is always compiled in U-Boot and CONFIG_ENV_SUPPORT
don't exist; so the macro CONFIG_IS_ENABLED(ENV_SUPPORT) only provides
the expected result for SPL and TPL (check activation of
CONFIG_SPL_ENV_SUPPORT and CONFIG_TPL_ENV_SUPPORT).

This patch solves the regression introduced by
commit 7d4776545b0f ("env: solve compilation error
in SPL"); change_ok was always NULL in U-Boot.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 env/common.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/env/common.c b/env/common.c
index 3fb60509dd..f677b5b0da 100644
--- a/env/common.c
+++ b/env/common.c
@@ -24,8 +24,10 @@ DECLARE_GLOBAL_DATA_PTR;
 #include <env_default.h>
 
 struct hsearch_data env_htab = {
-#if CONFIG_IS_ENABLED(ENV_SUPPORT)
-	/* defined in flags.c, only compile with ENV_SUPPORT */
+#if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(ENV_SUPPORT)
+	/* defined in flags.c, only compiled in U-Boot or
+	 * with $(SPL_TPL_)ENV_SUPPORT
+	 */
 	.change_ok = env_flags_validate,
 #endif
 };
-- 
2.17.1