[Fix] Wrong fix of cache use for STM32

Author: elpekenin

ports/stm/supervisor/internal_flash.c

@@ -302,9 +302,9 @@ mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t n
     uint32_t sector_start_addr;
     flash_get_sector_info(src, &sector_start_addr, &sector_size);
     // Count how many blocks are left in the sector
-    uint32_t count = (sector_size - (src - sector_start_addr)) / FILESYSTEM_BLOCK_SIZE;
+    uint32_t blocks_left_in_sector = (sector_size - (src - sector_start_addr)) / FILESYSTEM_BLOCK_SIZE;
 
-    if (count <= num_blocks && _cache_flash_addr == sector_start_addr) {
+    if (num_blocks <= blocks_left_in_sector && _cache_flash_addr == sector_start_addr) {
         // Read is contained in the cache, so just read cache
         memcpy(dest, (_flash_cache + (src - sector_start_addr)), FILESYSTEM_BLOCK_SIZE * num_blocks);
     } else {