tcsetattr breaks terminal

[bpereto]

Hi,

the commit introduced in #14 breaks the terminal with shifted lines.
Afterwards, no input to the terminal is displayed.

./ykfde -S
Please give current second factor:
  Failed setting terminal attributes.
                                     loaded device: luks-2e8cb1b1-8854-4838-a524-fa7573aeda52 
              loaded device: luks-7dcfeca3-15c1-4a33-8167-05428fcee703 
                                                                       Failed requesting key. That's ok if you do not use
                                         second factor. Give it manually if required.

Failed setting terminal attributes shows up at

mkinitcpio-ykfde/bin/ykfde.c

Line 94 in b5ad306

if (tcsetattr(STDIN_FILENO, TCSANOW, &tp_save) < 0) {