avfilter/vf_perspective: use lrint instead of floor hack
Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NGanesh Ajjanagadde <gajjanagadde@gmail.com>
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Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NGanesh Ajjanagadde <gajjanagadde@gmail.com>