This was an error, we cannot use sbuf_trim(9) in the ixgbe_get_phy_firmware_version function because it also gets called in the context of sbuf_new_for_sysctl(9). sbuf(9) explains the interaction with drain functions as used by sbuf_new_for_sysctl(9).
MFC after: 1 day
Fixes: 7660e4ea5cb7