[PATCH] drivers/isdn/hisax/: proper prototypes

- add functions prototypes for some global functions to header files

- remove unneeded "extern"s from some function prototypes

You might note that this patch results in a new warning - that's due to the
fact that with a proper prototype gcc is able to discover a broken
work_struct conversion.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/hisax/isar.c

@@ -431,7 +431,6 @@ reterror:
 	return(ret);
 }
 
-extern void BChannel_bh(struct BCState *);
 #define B_LL_NOCARRIER	8
 #define B_LL_CONNECT	9
 #define B_LL_OK		10