Staging: android: lowmemorykiller: Don't count free space unless it meets the...

Staging: android: lowmemorykiller: Don't count free space unless it meets the specified limit by itself

From: Arve Hjønnevåg <arve@android.com>

This allows processes to be killed when the kernel evict cache pages in
an attempt to get more contiguous free memory.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Cc: David Rientjes <rientjes@google.com>
Cc: San Mehat <san@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>