Clang warns:

drivers/net/dsa/sja1105/sja1105_main.c:3418:38: warning: address of
array 'match->compatible' will always evaluate to 'true'
[-Wpointer-bool-conversion]
        for (match = sja1105_dt_ids; match->compatible; match++) {
        ~~~                          ~~~~~~~^~~~~~~~~~
1 warning generated.

We should check the value of the first character in compatible to see if
it is empty or not. This matches how the rest of the tree iterates over
IDs.

Fixes: 0b0e2997 ("net: dsa: sja1105: use detected device id instead of DT one on mismatch")
Link: https://github.com/ClangBuiltLinux/linux/issues/1139Signed-off-by: NNathan Chancellor <natechancellor@gmail.com>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NVladimir Oltean <olteanv@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>