[BusyBox] avoid trying to 'insmod (null)' when 'modprobe non_existent_module' is called

[egor duda]

Hi!

Attached patch prevents modprobe from trying to call 'insmod (null)' 
whenever nonexistent module is either passed to modprobe via command 
line or mentioned in modules.dep

this replaces cryptic error
sh: Syntax error: word unexpected (expecting ")")
with
modprobe: module some-module not found.

egor.
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