Check for negative positional values in the playSfx() function.

From http://www.gitorious.org/manaplus/manaplus/commit/6c885855b0c06bd7c4b6ab3574d8e2f3398ad97a

Thanks to 4144.

Trivial.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/sound.cpp b/src/sound.cpp
index a8090f84..c64e10d8 100644
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -253,6 +253,10 @@ void Sound::playSfx(const std::string &path, int x, int y)
             if (dy < 0)
                 dy = -dy;
             int dist = dx > dy ? dx : dy;
+
+            // Check for negative values
+            if (dist * 8 > vol)
+                return;
             vol -= dist * 8;
         }
         sample->play(0, vol);