env: make env_import(_redund) return 0 on success, not 1

env_import (and env_import_redund) currently return 1 on success
and 0 on error. However, they are only used from functions
returning 0 on success or a negative value on error.

Let's clean this up by making env_import and env_import_redund
return 0 on success and -EIO on error (as was the case for all
users before).

Users that cared for the return value are also updated. Funny
enough, this only affects onenand.c and sf.c

Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

env/common.c

@@ -118,21 +118,21 @@ int env_import(const char *buf, int check)
 
 		if (crc32(0, ep->data, ENV_SIZE) != crc) {
 			set_default_env("!bad CRC");
-			return 0;
+			return -EIO;
 		}
 	}
 
 	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
 			0, NULL)) {
 		gd->flags |= GD_FLG_ENV_READY;
-		return 1;
+		return 0;
 	}
 
 	pr_err("Cannot import environment: errno = %d\n", errno);
 
 	set_default_env("!import failed");
 
-	return 0;
+	return -EIO;
 }
 
 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
@@ -153,7 +153,7 @@ int env_import_redund(const char *buf1, const char *buf2)
 
 	if (!crc1_ok && !crc2_ok) {
 		set_default_env("!bad CRC");
-		return 0;
+		return -EIO;
 	} else if (crc1_ok && !crc2_ok) {
 		gd->env_valid = ENV_VALID;
 	} else if (!crc1_ok && crc2_ok) {

env/onenand.c

@@ -57,10 +57,10 @@ static int env_onenand_load(void)
 #endif /* !ENV_IS_EMBEDDED */
 
 	rc = env_import(buf, 1);
-	if (rc)
+	if (!rc)
 		gd->env_valid = ENV_VALID;
 
-	return rc ? 0 : -EIO;
+	return rc;
 }
 
 static int env_onenand_save(void)

env/sf.c

@@ -236,7 +236,7 @@ static int env_sf_load(void)
 		ep = tmp_env2;
 
 	ret = env_import((char *)ep, 0);
-	if (!ret) {
+	if (ret) {
 		pr_err("Cannot import environment: errno = %d\n", errno);
 		set_default_env("!env_import failed");
 	}
@@ -336,7 +336,7 @@ static int env_sf_load(void)
 	}
 
 	ret = env_import(buf, 1);
-	if (ret)
+	if (!ret)
 		gd->env_valid = ENV_VALID;
 
 err_read: