All were forward declared static already.
Fixes sparse warnings:
drivers/char/moxa.c:1421:6: warning: symbol 'MoxaDriverInit' was not declared. Should it be static?
drivers/char/moxa.c:1464:6: warning: symbol 'MoxaPortFlushData' was not declared. Should it be static?
drivers/char/moxa.c:1477:5: warning: symbol 'MoxaDriverIoctl' was not declared. Should it be static?
drivers/char/moxa.c:1604:5: warning: symbol 'MoxaDriverPoll' was not declared. Should it be static?
drivers/char/moxa.c:1667:5: warning: symbol 'MoxaPortsOfCard' was not declared. Should it be static?
drivers/char/moxa.c:1954:5: warning: symbol 'MoxaPortIsValid' was not declared. Should it be static?
drivers/char/moxa.c:1964:6: warning: symbol 'MoxaPortEnable' was not declared. Should it be static?
drivers/char/moxa.c:1987:6: warning: symbol 'MoxaPortDisable' was not declared. Should it be static?
drivers/char/moxa.c:1997:6: warning: symbol 'MoxaPortGetMaxBaud' was not declared. Should it be static?
drivers/char/moxa.c:2007:6: warning: symbol 'MoxaPortSetBaud' was not declared. Should it be static?
drivers/char/moxa.c:2031:5: warning: symbol 'MoxaPortSetTermio' was not declared. Should it be static?
drivers/char/moxa.c:2087:5: warning: symbol 'MoxaPortGetLineOut' was not declared. Should it be static?
drivers/char/moxa.c:2107:6: warning: symbol 'MoxaPortLineCtrl' was not declared. Should it be static?
drivers/char/moxa.c:2122:6: warning: symbol 'MoxaPortFlowCtrl' was not declared. Should it be static?
drivers/char/moxa.c:2142:5: warning: symbol 'MoxaPortLineStatus' was not declared. Should it be static?
drivers/char/moxa.c:2168:5: warning: symbol 'MoxaPortDCDChange' was not declared. Should it be static?
drivers/char/moxa.c:2180:5: warning: symbol 'MoxaPortDCDON' was not declared. Should it be static?
drivers/char/moxa.c:2193:5: warning: symbol 'MoxaPortWriteData' was not declared. Should it be static?
drivers/char/moxa.c:2257:5: warning: symbol 'MoxaPortReadData' was not declared. Should it be static?
drivers/char/moxa.c:2327:5: warning: symbol 'MoxaPortTxQueue' was not declared. Should it be static?
drivers/char/moxa.c:2341:5: warning: symbol 'MoxaPortTxFree' was not declared. Should it be static?
drivers/char/moxa.c:2355:5: warning: symbol 'MoxaPortRxQueue' was not declared. Should it be static?
drivers/char/moxa.c:2370:6: warning: symbol 'MoxaPortTxDisable' was not declared. Should it be static?
drivers/char/moxa.c:2378:6: warning: symbol 'MoxaPortTxEnable' was not declared. Should it be static?
drivers/char/moxa.c:2387:5: warning: symbol 'MoxaPortResetBrkCnt' was not declared. Should it be static?
drivers/char/moxa.c:2396:6: warning: symbol 'MoxaPortSendBreak' was not declared. Should it be static?