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nusb/kb: remove mouse acceleration -a flag

mouse acceleration can be done by software in the kernels
devmouse device like:

echo hwaccel off >/dev/mousectl
echo accelerated 5 >/dev/mousectl

it is hard to pass nusb/kb parameters anyway as it is started
from nusbrc in bootfs.paq, so i remove the option.

--- a/sys/man/4/nusb

+++ b/sys/man/4/nusb

@@ -32,10 +32,7 @@

 .B nusb/kb

 [

 .B -d

-] [

-.B -a

-.I n

-] 

+]

 .I devid

 .PP

 .B nusb/serial

@@ -117,12 +114,6 @@

 Mouse events are sent to

 .BR /dev/mousein

 in the same way.

-.PP

-The option

-.B \-a

-accelerates the mouse to level

-.I n

-(similar to the kernel's mouse driver acceleration).

 .SS Disks

 .I Disk

 configures and manages USB mass storage devices. It

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -779,7 +779,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [-d] [-a n] devid\n", argv0);

+	fprint(2, "usage: %s [-d] devid\n", argv0);

 	threadexits("usage");

 }

@@ -792,8 +792,6 @@

 	Usbdev *ud;

 	ARGBEGIN{

-	case 'a':

-		break;

 	case 'd':

 		debug++;

 		break;