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vesa: make unsupported function not an error, set return status

--- a/sys/src/cmd/vmx/vesa.c

+++ b/sys/src/cmd/vmx/vesa.c

@@ -622,7 +622,8 @@

 			if(vesaddc(&ur) < 0 || vesasetregs(sp, &ur) < 0) continue;

 			break;

 		default:

-			vmerror("vesa: unsupported function %#x", ur.ax);

+			vesasetax(sp, 0x0100);

+			vmdebug("vesa: unsupported function %#x", ur.ax);

 		}

 	}

 }