drivers/char/mxser.c: fix compilation warning in mxser.c

Both mxser_disable_must_enchance_mode() and mxser_get_must_hardware_id()
called from function CheckIsMoxaMust(), when CONFIG_PCI=y.  So mark both
the functions under CONFIG_PCI.

We were warned by the following warning.

drivers/char/mxser.c:306: warning: `mxser_disable_must_enchance_mode' defined but not used
drivers/char/mxser.c:391: warning: `mxser_get_must_hardware_id'
defined but not used
Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/mxser.c

@@ -303,6 +303,7 @@ static void mxser_enable_must_enchance_mode(unsigned long baseio)
 	outb(oldlcr, baseio + UART_LCR);
 }
 
+#ifdef	CONFIG_PCI
 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 {
 	u8 oldlcr;
@@ -317,6 +318,7 @@ static void mxser_disable_must_enchance_mode(unsigned long baseio)
 	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 	outb(oldlcr, baseio + UART_LCR);
 }
+#endif
 
 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 {
@@ -388,6 +390,7 @@ static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 	outb(oldlcr, baseio + UART_LCR);
 }
 
+#ifdef CONFIG_PCI
 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 {
 	u8 oldlcr;
@@ -404,6 +407,7 @@ static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 	*pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 	outb(oldlcr, baseio + UART_LCR);
 }
+#endif
 
 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 {