Fixed bug in listfileinfo(FI_USERXFER) when the xfer.ixt file didn't exist or was 0-length.

src/sbbs3/listfile.cpp

@@ -834,7 +834,9 @@ int sbbs_t::listfileinfo(uint dirnum, char *filespec, long mode)
 	struct	tm * tm;
 
 	sprintf(str,"%sxfer.ixt",cfg.data_dir);
-	if(mode==FI_USERXFER && flength(str)>0L) {
+	if(mode==FI_USERXFER) {
+		if(flength(str)<1L)
+			return(0);
 		if((file=nopen(str,O_RDONLY))==-1) {
 			errormsg(WHERE,ERR_OPEN,str,O_RDONLY);
 			return(0); }