serial: altera_jtaguart: switch status to u32

'status' is assigned a result from readl(). There is no need for the
variable to be 'unsigned long'. readl() returns 32bit values.

Provided, this is a Nios II driver (32-bit), there is no change in
semantics. This only makes the type explicit.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Tobias Klauser <tklauser@distanz.ch>
Link: https://lore.kernel.org/r/20230731080244.2698-7-jirislaby@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>