pki: Fix return values of ssh_key_is_(public|private)
pki: Fix return values of ssh_key_is_(public|private)

Thanks to Kevin Haake <khaake@red-cocoa.com>

Signed-off-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>

pouete/libssh,pouete/libssh,nviennot/libssh,kedazo/libssh,sebadoom/libssh,kedazo/libssh,sebadoom/libssh,nviennot/libssh,pouete/libssh,nviennot/libssh,nviennot/libssh,sebadoom/libssh,pouete/libssh,kedazo/libssh,kedazo/libssh,sebadoom/libssh