fixed solosky#193: fixed crash when enter card emulator app

Author: solosky

fw/application/src/app/chameleon/port/fds_utils.c

@@ -22,10 +22,11 @@ static void fds_map_file_name(uint16_t id, uint16_t key, char *path) {
     }
 }
 
-bool fds_read_sync(uint16_t id, uint16_t key, uint16_t max_length, uint8_t *buffer) {
+bool fds_read_sync(uint16_t id, uint16_t key, uint16_t* max_length, uint8_t *buffer) {
     char path[VFS_MAX_PATH_LEN];
     fds_map_file_name(id, key, path);
-    int32_t bytes_read = vfs_get_default_driver()->read_file_data(path, buffer, max_length);
+    int32_t bytes_read = vfs_get_default_driver()->read_file_data(path, buffer, *max_length);
+    *max_length = bytes_read;
     NRF_LOG_INFO("fds_read_sync: id=%X, key=%d, bytes_read=%d", id, key, bytes_read);
     return bytes_read > 0;
 }