module: Prevent silent truncation of module name in delete_module(2)

Passing a module name longer than MODULE_NAME_LEN to the delete_module
syscall results in its silent truncation. This really isn't much of
a problem in practice, but it could theoretically lead to the removal of an
incorrect module. It is more sensible to return ENAMETOOLONG or ENOENT in
such a case.

Update the syscall to return ENOENT, as documented in the delete_module(2)
man page to mean "No module by that name exists." This is appropriate
because a module with a name longer than MODULE_NAME_LEN cannot be loaded
in the first place.

Signed-off-by: Petr Pavlu <[email protected]>
Reviewed-by: Daniel Gomez <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Gomez <[email protected]>

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