mxssb: Save line number alongside command line

Save the number at which line the command was. This will help when
reporting errors from the parser.
Signed-off-by: Marek Vasut <marex@denx.de>

mxssb.c

@@ -47,6 +47,7 @@ struct sb_cmd_list {
 	struct sb_cmd_list		*next;
 	char				*cmd;
 	size_t				len;
+	unsigned int			lineno;
 };
 
 struct sb_cmd_ctx {
@@ -935,12 +936,11 @@ static int sb_fixup_sections_and_tags(struct sb_image_ctx *ictx)
 static int sb_load_cmdfile(struct sb_image_ctx *ictx)
 {
 	struct sb_cmd_list *head = NULL, *prev = NULL, *curr;
-
-	int fd;
+	int fd, lineno = 1;
 	FILE *fp;
 	char *line = NULL;
 	ssize_t rlen;
-	size_t len = 0;
+	size_t len;
 
 	fd = open(ictx->cfg_filename, O_RDONLY);
 	if (fd < 0)
@@ -959,6 +959,7 @@ static int sb_load_cmdfile(struct sb_image_ctx *ictx)
 
 		curr->cmd = line;
 		curr->len = rlen;
+		curr->lineno = lineno++;
 		line[rlen - 1] = 0;
 
 		if (prev)