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reform/pm: kbdoled: clear the OLED on zero-length write

--- a/sys/man/1/reform

+++ b/sys/man/1/reform

@@ -111,7 +111,8 @@

 .TP

 .B kbdoled

 An image can be displayed on the keyboard OLED by writing a 126x32x1

-uncompressed Plan 9 image (with or without a header).

+uncompressed Plan 9 image (with or without a header).  Zero-length

+write clears the display.

 .TP

 .B light

 Provides a way to control the backlight of the built-in LCD by

--- a/sys/src/cmd/reform/pm.c

+++ b/sys/src/cmd/reform/pm.c

@@ -157,6 +157,11 @@

 	int x, y, i, k, v, bpl;

 	u8int *p, q;

+	if(openkbdhid() != 0)

+		return -1;

+	if(size == 0)

+		return write(kbdhidfd, "WCLR", 4);

+

 	bpl = bytesperline(kbdoled->r, kbdoled->depth);

 	if(size == 60+bpl*KbdoledH){

 		data = (u8int*)data + 60;