settings_fcb: Fix storing the data

Change fixes storing the data by adding missing write retry after
the last compression. Without the change error was returned instead
of retrying.

This is manual back-port of zephyrproject-rtos#25518

Signed-off-by: Marek Pieta <Marek.Pieta@nordicsemi.no>
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

subsys/settings/src/settings_fcb.c

@@ -260,12 +260,16 @@ static int settings_fcb_save(struct settings_store *cs, const char *name,
 	wbs = cf->cf_fcb.f_align;
 	len = settings_line_len_calc(name, val_len);
 
-	for (i = 0; i < cf->cf_fcb.f_sector_cnt - 1; i++) {
+	for (i = 0; i < cf->cf_fcb.f_sector_cnt; i++) {
 		rc = fcb_append(&cf->cf_fcb, len, &loc.loc);
 		if (rc != FCB_ERR_NOSPACE) {
 			break;
 		}
-		settings_fcb_compress(cf);
+
+		/* FCB can compress up to cf->cf_fcb.f_sector_cnt - 1 times. */
+		if (i < (cf->cf_fcb.f_sector_cnt - 1)) {
+			settings_fcb_compress(cf);
+		}
 	}
 	if (rc) {
 		return -EINVAL;