Add forgotten "-passin" option to smime.c usage help.

apps/smime.c

@@ -298,6 +298,7 @@ int MAIN(int argc, char **argv)
 		BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 		BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 		BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
+		BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
 		BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 		BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 		BIO_printf(bio_err,  "               the random number generator\n");