Truncate trailing whitespace before computing name CRCs

Some BBS packages tack on trailing whitespace on names, e.g.
https://github.com/wwivbbs/wwiv/issues/1607

src/smblib/smbhash.c

@@ -406,6 +406,7 @@ uint16_t smb_name_crc(const char* name)
 		return(0xffff);
 
 	strlwr(str);
+	truncsp(str);
 	crc=crc16(str,0	/* auto-length */);
 	free(str);