Changes for dgst cmd not working 2nd time (#32)

Co-authored-by: neelimap <neelimaps@neominds.in>
Reviewed-on: http://13.234.246.121:3000/Neominds/ossl35vx69/pulls/32
Co-authored-by: Neelima P S <neelima.ps@neominds.in>
Co-committed-by: Neelima P S <neelima.ps@neominds.in>

vxworks-6.9/target/src/openssl/OPENSSL/openssl-3.5.0/apps/dgst.c

@@ -117,6 +117,8 @@ int dgst_main(int argc, char **argv)
     EVP_MD_CTX *signctx = NULL;
     int oneshot_sign = 0;
 
+    reset_unknown();
+
     buf = app_malloc(BUFSIZE, "I/O buffer");
     md = (EVP_MD *)EVP_get_digestbyname(argv[0]);
     if (md != NULL)