defrag.f2fs: return error if there is no space
defrag.f2fs: return error if there is no space

This patch checks whether there is a space or not to allocate new blocks.

Change-Id: I92bfd159b820d8364d3f081e571cef9fec99d76c
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

PAC-ROM/android_external_f2fs-tools,blastagator/cm_external_f2fs-tools,blastagator/cm_external_f2fs-tools,PAC-ROM/android_external_f2fs-tools