macintosh/via-macii: Use the stack for reset request storage

The adb_request struct can be stored on the stack because the request
is synchronous and is completed before the function returns.
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a40f80dde90991757007b6962c386a208c970586.1593318192.git.fthain@telegraphics.com.au

drivers/macintosh/via-macii.c

@@ -313,7 +313,7 @@ static void macii_poll(void)
 /* Reset the bus */
 static int macii_reset_bus(void)
 {
-	static struct adb_request req;
+	struct adb_request req;
 
 	/* Command = 0, Address = ignored */
 	adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);