tests: Close SFTP file opened during rekey tests

The SFTP files wouldn't be closed during the rekey tests leading to
memory leak.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

tests/client/torture_rekey.c

@@ -269,6 +269,7 @@ static void torture_rekey_recv(void **state)
     int fd;
     sftp_file file;
     mode_t mask;
+    int rc;
 
     /* The blocks limit is set correctly */
     c = s->ssh.session->current_crypto;
@@ -302,6 +303,8 @@ static void torture_rekey_recv(void **state)
         assert_int_equal(byteswritten, bytesread);
     }
 
+    rc = sftp_close(file);
+    assert_int_equal(rc, SSH_NO_ERROR);
     close(fd);
 
     /* The rekey limit was restored in the new crypto to the same value */
@@ -465,6 +468,7 @@ static void torture_rekey_server_recv(void **state)
     int fd;
     sftp_file file;
     mode_t mask;
+    int rc;
 
     /* Copy the initial secret hash = session_id so we know we changed keys later */
     c = s->ssh.session->current_crypto;
@@ -492,6 +496,8 @@ static void torture_rekey_server_recv(void **state)
         assert_int_equal(byteswritten, bytesread);
     }
 
+    rc = sftp_close(file);
+    assert_int_equal(rc, SSH_NO_ERROR);
     close(fd);
 
     /* Check that the secret hash is different than initially */