Fix aux/flashfs to be compatible with the port/devflash.c
format instead of bitsy/devflash.c.

Since the Bitsy port is now deprecated (2013-01-30), there
is no longer need to keep the default behavior of aux/flashfs
compatible with it.

/sys/src/9/port/devflash.c
	On /dev/flash/partctl, the second word of the
	second line is the size of the partition

/sys/src/9/bitsy/devflash.c
	On /dev/flash/partctl, the second word of the
	second line is the end offset of the partition

Reference: /n/sources/patch/maybe/flashfs-port
Date: Wed Jan 30 23:48:37 CET 2013
Signed-off-by: djc@9grid.fr

--- /sys/src/cmd/aux/flashfs/devfs.c	Wed Jan 30 23:48:22 2013
+++ /sys/src/cmd/aux/flashfs/devfs.c	Wed Jan 30 23:48:18 2013
@@ -61,8 +61,8 @@
 		n = tokenize(buf, fld, nelem(fld));
 		if(n < 7)
 			sysfatal("bad flash geometry");
-		nsects = atoi(fld[5]);
 		sectsize = atoi(fld[6]);
+		nsects = (atoi(fld[5])-atoi(fld[4]))/sectsize;
 		if(nsects < 8)
 			sysfatal("unreasonable value for nsects: %lud", nsects);
 		if(sectsize < 512)