mgen: calibrate_cpuinfo: ensure we do not overflow buffer unit
mgen: calibrate_cpuinfo: ensure we do not overflow buffer unit

cppcheck found a potential buffer overflow:

[test/mgen/mgen.c:219]: (error) Width 10 given in format string
  (no. 2) is larger than destination buffer 'unit[10]', use %9s
  to prevent overflowing it.

Increase unit array to 11 bytes.

Signed-off-by: Colin Ian King <d100aa70785e45ee8deab668147d941941915c21@canonical.com>

intel/numatop,ColinIanKing/numatop,ColinIanKing/numatop,hoangt/numatop,01org/numatop,01org/numatop,ColinIanKing/numatop,intel/numatop,wdv4758h/numatop,omorenopuello/numatop,daniel-ortiz/numatop