jffs2_scan_eraseblock scan only 1 KiB not 4 KiB of 0xFF

@@ -325,7 +325,7 @@
 	/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
 	ofs = 0;
 
-	/* Scan only 4KiB of 0xFF before declaring it's empty */
+	/* Scan only 1KiB of 0xFF before declaring it's empty */
 	while(ofs < EMPTY_SCAN_SIZE && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
 		ofs += 4;