net/smc: Improve log message for devices w/o pnetid

Explicitly state in the log message, when a device has no pnetid.
"with pnetid" and "has pnetid" was misleading for devices without pnetid.

Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250901145842.1718373-3-wintera@linux.ibm.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>