kernel: Make /dev/console actually respect the length parameter instead of trusting userspace's null terminators

kernel/src/fs/devices/ConsoleDevice.cpp

@@ -14,6 +14,6 @@ Result<usize> ConsoleDevice::read(u8*, usize, usize) const
 
 Result<usize> ConsoleDevice::write(const u8* buf, usize, usize length)
 {
-    TextConsole::print((const char*)buf);
+    TextConsole::write((const char*)buf, length);
     return length;
 }