fix em4x50_read function

affected `lf search` and `lf em 4x50 rdbl -b <blk>`

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Fixed em4x50_read() - `lf search` and `lf em 4x50 rdbl -b <blk>` does not coredump reading EM4450 tag (@ANTodorov)
 - Fixed flashing - client doesnt fail every other flash attempt (@iceman1001)
 - Changed `pref show` - add option to dump as JSON (@doegox)
 - Changed `mf_backdoor_dump.py`- use faster ecfill/eview (@doegox)

client/src/cmdlfem4x50.c

@@ -639,10 +639,8 @@ int em4x50_read(em4x50_data_t *etd, em4x50_word_t *out) {
         return PM3_ESOFT;
     }
 
-    em4x50_read_data_response_t *o = (em4x50_read_data_response_t *)resp.data.asBytes;
-
     em4x50_word_t words[EM4X50_NO_WORDS] = {0};
-    em4x50_prepare_result((uint8_t *)o->words, etd->addresses & 0xFF, (etd->addresses >> 8) & 0xFF, words);
+    em4x50_prepare_result(resp.data.asBytes, etd->addresses & 0xFF, (etd->addresses >> 8) & 0xFF, words);
 
     if (out != NULL) {
         memcpy(out, &words, sizeof(em4x50_word_t) * EM4X50_NO_WORDS);