gigaset: Kconfig cleanup

Streamline dependencies and remove some obsolete or redundant comments
in the Gigaset ISDN driver's Kconfig file. In particular, remove the
strong warning against the GIGASET_UNDOCREQ option, as in seven years
of existence, the code in question has never been reported to cause
any harm.

Impact: Kconfig cleanup, no functional change
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/gigaset/Kconfig

 menuconfig ISDN_DRV_GIGASET
-	tristate "Siemens Gigaset support (isdn)"
+	tristate "Siemens Gigaset support"
 	select CRC_CCITT
 	select BITREVERSE
 	help
@@ -11,11 +11,11 @@ menuconfig ISDN_DRV_GIGASET
 	  one of the connection specific parts that follow.
 	  This will build a module called "gigaset".
 
-if ISDN_DRV_GIGASET!=n
+if ISDN_DRV_GIGASET
 
 config GIGASET_BASE
 	tristate "Gigaset base station support"
-	depends on ISDN_DRV_GIGASET && USB
+	depends on USB
 	help
 	  Say M here if you want to use the USB interface of the Gigaset
 	  base for connection to your system.
@@ -23,7 +23,7 @@ config GIGASET_BASE
 
 config GIGASET_M105
 	tristate "Gigaset M105 support"
-	depends on ISDN_DRV_GIGASET && USB
+	depends on USB
 	help
 	  Say M here if you want to connect to the Gigaset base via DECT
 	  using a Gigaset M105 (Sinus 45 Data 2) USB DECT device.
@@ -31,7 +31,6 @@ config GIGASET_M105
 
 config GIGASET_M101
 	tristate "Gigaset M101 support"
-	depends on ISDN_DRV_GIGASET
 	help
 	  Say M here if you want to connect to the Gigaset base via DECT
 	  using a Gigaset M101 (Sinus 45 Data 1) RS232 DECT device.
@@ -48,7 +47,6 @@ config GIGASET_UNDOCREQ
 	help
 	  This enables support for USB requests we only know from
 	  reverse engineering (currently M105 only). If you need
-	  features like configuration mode of M105, say yes. If you
-	  care about your device, say no.
+	  features like configuration mode of M105, say yes.
 
-endif # ISDN_DRV_GIGASET != n
+endif # ISDN_DRV_GIGASET