Fix bugus "wrong checksum" error after downloading pk3

This commit also fixes bug in ignored downloads feature where ignored
file would get wrong checksum saved to dlblacklist.dat and not get
ignored in some cases

src/qcommon/files.cpp

@@ -3273,13 +3273,15 @@ qboolean FS_ComparePaks( char *neededpaks, int len, int *chksums, size_t maxchks
 	searchpath_t	*sp;
 	qboolean havepak, badchecksum, badname;
 	int i;
+	int paknum; // number of paks in neededpaks string (not counting dl_ duplicates)
 
 	if ( !fs_numServerReferencedPaks ) {
 		return qfalse; // Server didn't send any pack information along
 	}
 
 	*neededpaks = 0;
 	badname = qfalse;
+	paknum = 0;
 
 	for ( i = 0 ; i < fs_numServerReferencedPaks ; i++ ) {
 		// Ok, see if we have this pak file
@@ -3355,11 +3357,14 @@ qboolean FS_ComparePaks( char *neededpaks, int len, int *chksums, size_t maxchks
 					break;
 				}
 
-				Q_strcat( neededpaks, len, currentPak );
-
-				if (chksums && i < (int)maxchksums) {
-					chksums[i] = fs_serverReferencedPaks[i];
+				if (paknum + 1 >= (int)maxchksums) {
+					Com_Printf( S_COLOR_YELLOW "WARNING (FS_ComparePaks): referenced pk3 files cut off because there are too many\n" );
+					break;
 				}
+
+				Q_strcat( neededpaks, len, currentPak );
+				chksums[paknum] = fs_serverReferencedPaks[i];
+				paknum++;
 			} else {
 				char st[MAX_ZPATH];
 
@@ -3370,6 +3375,7 @@ qboolean FS_ComparePaks( char *neededpaks, int len, int *chksums, size_t maxchks
 				if ( FS_SV_FileExists(va("%s/dl_%s.pk3", moddir, filename)) ) {
 					Q_strcat( neededpaks, len, " (local file exists with wrong checksum)");
 				}
+
 				Q_strcat( neededpaks, len, "\n");
 			}
 		}