param: fix lots of bugs with writing charp params from sysfs, by leaking mem.

e180a6b7759a "param: fix charp parameters set via sysfs" fixed the case
where charp parameters written via sysfs were freed, leaving drivers
accessing random memory.

Unfortunately, storing a flag in the kparam struct was a bad idea: it's
rodata so setting it causes an oops on some archs.  But that's not all:

1) module_param_array() on charp doesn't work reliably, since we use an
   uninitialized temporary struct kernel_param.
2) there's a fundamental race if a module uses this parameter and then
   it's changed: they will still access the old, freed, memory.

The simplest fix (ie. for 2.6.32) is to never free the memory.  This
prevents all these problems, at cost of a memory leak.  In practice, there
are only 18 places where a charp is writable via sysfs, and all are
root-only writable.

Reported-by: Takashi Iwai <[email protected]>
Cc: Sitsofe Wheeler <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Christof Schmitt <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Cc: [email protected]

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