block, bfq: Switch from BFQ-v6 for 3.8 to BFQ-v6 for 3.9-rc2
remove EXPERIMENTAL
block: remove EXPERIMENTAL from BFQ
remove EXPERIMENTAL
remove EXPERIMENTAL
Merge branches '3.9/bfq', '3.9/dmraid45', '3.9/layer7' and '3.9/march-native' into 3.9/master
block, bfq: use the uninitialized_var() macro when needed

It may happen that a variable is initialized in a function that is
called by the function that defined it. Use the uninitialized_var()
macro in these cases.
Merge branch '3.9/bfq' into 3.9/master