Fix FingerprintKey

Author: yosuke-wolfssl

apps/wolfssh/common.c

@@ -218,6 +218,7 @@ static int FingerprintKey(const byte* pubKey, word32 pubKeySz, char* out)
         ret = wc_Sha256Update(&sha, pubKey, pubKeySz);
     if (ret == 0)
         ret = wc_Sha256Final(&sha, digest);
+    wc_Sha256Free(&sha);
 
     if (ret == 0)
         ret = Base64_Encode_NoNl(digest, sizeof(digest), (byte*)fp, &fpSz);