swaponoff: fix compile-time warning

  CC      util-linux/swaponoff.o
cc1: warnings being treated as errors
util-linux/swaponoff.c: In function 'swap_enable_disable':
util-linux/swaponoff.c:100: warning: passing argument 1 of 'resolve_mount_spec' from incompatible pointer type
make[1]: *** [util-linux/swaponoff.o] Error 1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed