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kernel: convert textmode cga screen contents to kmesg only once

screeninit() might be called again by devvga when switching
to textmode, so only convert the text framebuffer to kmesg
the first time.

--- a/sys/src/9/pc/cga.c

+++ b/sys/src/9/pc/cga.c

@@ -199,6 +199,8 @@

 void

 screeninit(void)

 {

+	static int once;

+

 	cgapos = cgaregr(0x0E)<<8;

 	cgapos |= cgaregr(0x0F);

 	cgapos *= 2;

@@ -208,8 +210,10 @@

 		movecursor();

 	}

-	cgatokmesg();

+	if(once == 0){

+		once = 1;

+		cgatokmesg();

+	}

 	screenputs = cgascreenputs;

 }

-