bmf: explicitly cast fgetc result into a char
bmf: explicitly cast fgetc result into a char

Coverity:
CID 739615 (#1 of 1): Truncated stdio return value (CHAR_IO)
Assigning the return value of "fgetc(FILE *)" to char "EthTapSpoofState"
truncates its value.

Signed-off-by: Ferry Huberts <66e11f9f5d965b69497c7e73d5e808f8b13c1218@pelagic.nl>

sebkur/olsrd,nolith/olsrd,tdz/olsrd,diogomg/olsrd,cholin/olsrd,cholin/olsrd,acinonyx/olsrd,diogomg/olsrd,tdz/olsrd,diogomg/olsrd,zioproto/olsrd,sebkur/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,ninuxorg/olsrd,acinonyx/olsrd,acinonyx/olsrd,acinonyx/olsrd,cholin/olsrd,sebkur/olsrd,diogomg/olsrd-binary-heap,ninuxorg/olsrd,nolith/olsrd,zioproto/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,diogomg/olsrd,tdz/olsrd,tdz/olsrd,nolith/olsrd,sebkur/olsrd,zioproto/olsrd,sebkur/olsrd,acinonyx/olsrd,zioproto/olsrd,diogomg/olsrd,zioproto/olsrd,ninuxorg/olsrd,cholin/olsrd,nolith/olsrd,sebkur/olsrd,ninuxorg/olsrd,diogomg/olsrd,ninuxorg/olsrd,nolith/olsrd,cholin/olsrd