Free psa crypto at the end of programs when initialized

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 13d96ea..83a31ad 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -457,6 +457,7 @@
 #endif
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+    mbedtls_psa_crypto_free();
 
     mbedtls_exit(exit_code);
 }