[Toybox] [PATCH] Fix modprobe error handling.

[enh]

modprobe was failing if you `modprobe a.ko`, then `modprobe b.ko` where b.ko
depends on a.ko --- b.ko will fail to load because a.ko is already loaded.
The code to handle this was incorrectly checking `rc` rather than `errno`
against EEXIST.

(We should pull the insmod.c equivalent of `ins_mod` out into lib/
and reuse it in modprobe.c, but I didn't want to get bogged down.)

Bug: https://issuetracker.google.com/112069618
Reported-by: Wen Xie <xiewen3 at motorola.com>
---
 toys/pending/modprobe.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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