wmfsm: hardcoded string sizes make the program crash

[badsectoracula]

wmfsm has some hardcoded limits for strings when parsing /etc/mtab which make it crash if for some reason the lines are longer than that. As a workaround i changed these to 16384 from 255 (which fixes my issue) but it might be a good idea to figure out a better approach than using fscanf on a loop.