env: fix the env export varname

The env export command doesn't export the first variable of the list
since commit 5a31ea04c9
"env grep" - reimplement command using hexport_r()

Signed-off-by: Pierre Aubert <p.aubert@staubli.com>

common/cmd_nvedit.c

@@ -157,10 +157,8 @@ static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
 	grep_how  = H_MATCH_SUBSTR;	/* default: substring search	*/
 	grep_what = H_MATCH_BOTH;	/* default: grep names and values */
 
-	while (argc > 1 && **(argv + 1) == '-') {
-		char *arg = *++argv;
-
-		--argc;
+	while (--argc > 0 && **++argv == '-') {
+		char *arg = *argv;
 		while (*++arg) {
 			switch (*arg) {
 #ifdef CONFIG_REGEX

lib/hashtable.c

@@ -564,7 +564,7 @@ static int match_entry(ENTRY *ep, int flag,
 	int arg;
 	void *priv = NULL;
 
-	for (arg = 1; arg < argc; ++arg) {
+	for (arg = 0; arg < argc; ++arg) {
 #ifdef CONFIG_REGEX
 		struct slre slre;