Fix warning about signedness

Note: the promoChar in ExcludeMoves was explicitly defined to make
sure the kludge promoChar = -1 for indicating best move works. But it
should be equivalent to casting the promoChar to (signed char) just
before the comparison.

diff --git a/backend.c b/backend.c
index 593398e..af2b247 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -6192,12 +6192,12 @@ UpdateExcludeHeader (int fromY, int fromX, int toY, int toX, char promoChar, cha
 }
 
 static int
-ExcludeOneMove (int fromY, int fromX, int toY, int toX, signed char promoChar, char state)
+ExcludeOneMove (int fromY, int fromX, int toY, int toX, char promoChar, char state)
 {   // include or exclude the given move, as specified by state ('+' or '-'), or toggle
     char buf[MSG_SIZ];
     int j, k;
     ChessMove moveType;
-    if(promoChar == -1) { // kludge to indicate best move
+    if((signed char)promoChar == -1) { // kludge to indicate best move
        if(!ParseOneMove(lastPV[0], currentMove, &moveType, &fromX, &fromY, &toX, &toY, &promoChar)) // get current best move from last PV
            return 1; // if unparsable, abort
     }