checkpatch: Fix bracing false positives on #if

789f88d0b21fedfd4251d56bb7a9fbfbda7a4ac7 only fixed #else,
fix also #if.

Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
