Kernel: remove message from BAN::Error

We don't store the error message anymore in BAN::Error.
Instead we store a error code that can be mapped into a string.
This allows BAN::Error to only take 4 bytes instead of 128.

We should also make some kernel initialization just panic instead
of returning errors since they are required for succesfull boot
anyway.

libc/include/errno.h

@@ -15,6 +15,7 @@
 #define ENAMETOOLONG 11
 #define ENOBUFS 12
 #define ENOTTY 13
+#define ENOTBLK 14
 
 __BEGIN_DECLS