params: cleanup sysfs allocation
commit 63662139 attempted to patch a leak (which would only happen on OOM, ie. never), but it didn't quite work. This rewrites the code to be as simple as possible. add_sysfs_param() adds a parameter. If it fails, it's the caller's responsibility to clean up the parameters which already exist. The kzalloc-then-always-krealloc pattern is perhaps overly simplistic, but this code has clearly confused people. It worked on me... Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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