[Toybox] [PATCH 1/2] insmod: tiny cleanup.

[enh]

finit_module(2) was added in Linux 3.8, and even CentOS 7.2 has 3.10, so
we should be able to assume that now rather than working around its
possible absence (especially in the *build* environment). I've left the
runtime workaround for now, since we need that to support the stdin use
case anyway.

Also add a missing error check for a failure to read, so we can give a
more relevant error message (we can't use xreadfile() because we need to
know the resulting size).
---
 toys/other/insmod.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)
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