Cleanup usr.sbin/fd* so they can compile under WARNS=6.

fdcontrol/fdcontrol.c:
	- Add const constraint to an intermediate value
	  which is not supposed to be changed elsewhere.
fdread/fdread.c:
	- Use _devname in favor of devname to avoid name
	  conflicit.
	- -1 is less than any positive number so in order
	  to get the block to function, we should get the
	  block a little earlier.
	- Cast to remove signed when we are sure that a
	  return value is positive, or is compared with
	  an positive number (tracknumber of a floppy
	  disk is not likely to have UINT_MAX/2 anyway)
fdread/fdutil.c:
	- Use more specific initializer
fdwrite/fdwrite.c:
	- Use static on format_track since it's not
	  referenced in other places.
	- Use const char* to represent string constant.

Bump WARNS accordingly.

1 files changed, 1 insertions, 1 deletions

diff --git a/usr.sbin/fdformat/Makefile b/usr.sbin/fdformat/Makefile
index 40ca9a7..a172811 100644
--- a/usr.sbin/fdformat/Makefile
+++ b/usr.sbin/fdformat/Makefile
@@ -5,7 +5,7 @@
 PROG=	fdformat
 SRCS=	fdformat.c fdutil.c
 
-WARNS?=	2
+WARNS?=	6
 CFLAGS+= -I${.CURDIR}/../fdread
 
 .if ${MACHINE} == "pc98"