unxz: show -t in --help

function                                             old     new   delta
packed_usage                                       33236   33247     +11

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

archival/bbunzip.c

@@ -536,6 +536,7 @@ int unlzma_main(int argc UNUSED_PARAM, char **argv)
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:     "\n	-k	Keep input files"
+//usage:     "\n	-t	Test file integrity"
 //usage:
 //usage:#define xz_trivial_usage
 //usage:       "-d [-cfk] [FILE]..."
@@ -545,6 +546,7 @@ int unlzma_main(int argc UNUSED_PARAM, char **argv)
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:     "\n	-k	Keep input files"
+//usage:     "\n	-t	Test file integrity"
 //usage:
 //usage:#define xzcat_trivial_usage
 //usage:       "[FILE]..."