Fix misleading indentation warning:

sys/dev/nxge/xgehal/xgehal-mgmt.c:1743:6: error: misleading indentation; statement is not part of the previous 'if' [-Werror,-Wmisleading-indentation]

addr = 0xA074;
^

sys/dev/nxge/xgehal/xgehal-mgmt.c:1736:2: note: previous statement is here

if(CHECKBIT(val_1, 0x0))
^

Direct commit to stable/11, since nxge(4) has been removed from FreeBSD
12 and later.