[Toybox] toybox: modprobe patch

[xiewen]

hi Guys:


     I find a bug in modprobe.c:
     In the following case, modprobe will fail:
     First ins_mod a.ko, then ins_mod b.ko, b.ko depends on a.ko,b.ko will insmod failed.
     Because syscall will return to EPERM, but finit_module and init_module actually return EEXIST,
     and EEXIST is stored in errno.


    Finally, I found that rm_mod uses errno as the return value, so I think ins_mod should also use errno as the return value.


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thanks with best regards!

email：wen.xie at archermind.com;xiewen202 at 163.com

phone：15850502564

 
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