get_acorn_filename(): deobfuscate a bit

Lots of Idiotic Silly Parentheses is -> that way...  What that
condition checks is that there's exactly 32 bytes between the
end of name and the end of entire drectory record.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index b943cbd..dfd14e1 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -58,7 +58,7 @@
 	std = sizeof(struct iso_directory_record) + de->name_len[0];
 	if (std & 1)
 		std++;
-	if ((*((unsigned char *) de) - std) != 32)
+	if (de->length[0] - std != 32)
 		return retnamlen;
 	chr = ((unsigned char *) de) + std;
 	if (strncmp(chr, "ARCHIMEDES", 10))