Merge branch 'mlxsw-Mirroring-cleanups'

Ido Schimmel says:

====================
mlxsw: Mirroring cleanups

This patch set contains various cleanups in SPAN (mirroring) code
noticed by Amit and I while working on future enhancements in this area.
No functional changes intended. Tested by current mirroring selftests.

Patches #1-#2 from Amit reduce nesting in a certain function and rename
a callback to a more meaningful name.

Patch #3 removes debug prints that have little value.

Patch #4 converts a reference count to 'refcount_t' in order to catch
over/under flows.

Patch #5 replaces a zero-length array with flexible-array member in
order to get a compiler warning in case the flexible array does not
occur last in the structure.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>