drivers: base: swnode: check if swnode is NULL before dereferencing it
The to_software_mode() macro can potentially return NULL, so also add a NULL check on swnode before dereferencing it to avoid any NULL pointer dereferences. Detected by CoverityScan, CID#1476052 ("Explicit null dereferenced") Fixes: 59abd836 (drivers: base: Introducing software nodes to the firmware node framework) Signed-off-by: NColin Ian King <colin.king@canonical.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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