Remove trailing whitespace before computing Subject CRC

Some responding programs will automatically remove the trailing white-space from subject when replying and that would mess up the subject-linkage-by-CRC. So let's just ignore trailing whitespace in the first place.

src/smblib/smbhash.c

@@ -387,6 +387,7 @@ uint16_t smb_subject_crc(const char* subj)
 		return(0xffff);
 
 	strlwr(str);
+	truncsp(str);
 	crc=crc16(str,0	/* auto-length */);
 	free(str);