[JFFS2] Clean up trailing white spaces

fs/Kconfig

fs/jffs2/background.c

fs/jffs2/build.c

fs/jffs2/compr.c

fs/jffs2/compr.h

fs/jffs2/compr_rtime.c

fs/jffs2/compr_rubin.c

fs/jffs2/compr_rubin.h

fs/jffs2/compr_zlib.c

fs/jffs2/comprtest.c

fs/jffs2/debug.c

fs/jffs2/debug.h

fs/jffs2/dir.c

fs/jffs2/erase.c

fs/jffs2/file.c

fs/jffs2/fs.c

fs/jffs2/gc.c

fs/jffs2/histo.h

fs/jffs2/histo_mips.h

fs/jffs2/ioctl.c