[CCID3]: Fix use of invalid loss intervals

This fixes a bug which uses an invalid comparison.
The bug resulted in the use of invalid loss intervals.

Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
---
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 38486a4..b0826c9 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -98,7 +98,7 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
 	u32 w_tot  = 0;
 
 	list_for_each_entry_safe(li_entry, li_next, list, dccplih_node) {
-		if (li_entry->dccplih_interval != ~0) {
+		if (li_entry->dccplih_interval != ~0U) {
 			i_tot0 += li_entry->dccplih_interval * dccp_li_hist_w[i];
 			w_tot  += dccp_li_hist_w[i];
 			if (i != 0)