igb: Fix format with line continuation whitespace

The line continuation unintentionally adds whitespace so
instead use a coalesced format to remove the whitespace.

Miscellanea:

o Use a more typical style for ternaries and arguments
  for this logging message

Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>