mxssb: Fixup handling of multiple sections

In case the parser comes across another section, it should return
into the section loop instead of treating it as an unknown instruction.
Signed-off-by: Marek Vasut <marex@denx.de>

mxssb.c

@@ -490,6 +490,11 @@ static int sb_tag_to_command(struct sb_cmd_ctx *cctx, char *line)
 		return 0;
 	}
 	len = strlen(tok);
+
+	/* Next section, return. */
+	if ((len == 7) && !strncmp(tok, "SECTION", 7))
+		return -ENOMSG;
+
 	if ((len != 3) && (len != 4)) {
 		fprintf(stderr, "WARN: Unknown command!\n");
 		return -EINVAL;
@@ -645,7 +650,12 @@ static int sb_parse_cmds(struct sb_section_ctx *sctx, struct sb_image_ctx *ictx)
 			head = cctx;
 
 		ret = sb_tag_to_command(cctx, line);
-		if (ret)
+		if (ret == -ENOMSG) {
+			free(line);
+			free(cctx);
+			ret = 0;
+			break;
+		} else if (ret)
 			goto err;
 
 		len += sizeof(struct sb_command);