Yet more whitespace and style neatening

o Add blank lines before returns
o Reverse a logic test and return early on error
o Move formats to same line as dev_<level> calls
o Remove an unnecessary period from a logging message
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>