checkpatch: if should not continue a preceeding brace

We should not be continuing a braced section with an if, for example:

	if (...) {
	} if (...) {
	}

Detect this and suggest adding a newline.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>