FreeBSD compilation warns with Tor 0.4.1.5

On tor-dev, grarpamp reports:

src/core/or/connection_edge.c:2563:5: warning: potential null pointer
dereference [-Wnull-dereference]
src/lib/math/fp.c:106:16: warning: conversion from 'double' to 'float'
may change value [-Wfloat-conversion]
src/lib/math/fp.c:111:18: warning: conversion from 'double' to 'float'
may change value [-Wfloat-conversion]
src/lib/math/fp.c:136:16: warning: conversion from 'double' to 'float'
may change value [-Wfloat-conversion]
src/lib/math/fp.c:88:13: warning: conversion from 'double' to 'float'
may change value [-Wfloat-conversion]

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