[PATCH net 3/3] net: mvneta: fix error messages in mvneta_port_down function

From: Gregory CLEMENT <redacted>
Date: Tue,  8 Mar 2016 13:57:06 +0100

From: Dmitri Epshtein <redacted>

This commit corrects error printing when shutting down the port. Also
magic numbers are replaced by existing macros.

Signed-off-by: Dmitri Epshtein <redacted>
Signed-off-by: Gregory CLEMENT <redacted>

Individual patches should do one thing, rather than several at once.

Please split this up into two changes, thanks.