Fixed hf mf fchk --mem to actually use flash dict

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 `hf mf fchk --mem` to actually use flash dict (@doegox)
 - Fixed `make install` on OSX thanks DaveItsLong (@doegox)
 
 ## [Blue Ice.4.20142][2025-03-25]

armsrc/mifarecmd.c

@@ -1955,6 +1955,7 @@ void MifareChkKeys_fast(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *da
         }
         // Replace client provided keys
         datain = dictkeys;
+        keyCount = key_mem_available;
     }
 #endif