Staging: nvec: Removes repeated word typo in comment

Fix a comment typo.
Signed-off-by: Ryan Kosta <ryanpkosta@gmail.com>
Link: https://lore.kernel.org/r/20200927172855.9813-1-ryanpkosta@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/nvec/nvec.c

@@ -289,7 +289,7 @@ EXPORT_SYMBOL(nvec_write_async);
  * interrupt handlers.
  *
  * Returns: 0 on success, a negative error code on failure.
- * The response message is returned in @msg. Shall be freed with
+ * The response message is returned in @msg. Shall be freed
  * with nvec_msg_free() once no longer used.
  *
  */