Use '& 7' instead '% 8' to silence clang analyzer warning

Graphics.c:569:10: warning: The result of the '<<' expression is undefined
        while (!QueryFlood(BW, x, y, value) && (x < x_right))
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Graphics.c:470:7: note: expanded from macro 'QueryFlood'
    ((GetBit(BW->bitmap.image, x, y) !=\
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Graphics.c:66:9: note: expanded from macro 'GetBit'
            (1 << ((x) % 8))) ? 1 : 0))
             ~~^~~~~~~~~~~~

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Graphics.c b/Graphics.c
index 39fea11..e8e7897 100644
--- a/Graphics.c
+++ b/Graphics.c
@@ -69,7 +69,7 @@ from The Open Group.
 
 #define GetBit(image, x, y)\
     ((bit)((*(image->data + (x) / 8 + (y) * image->bytes_per_line) &\
-	    (1 << ((x) % 8))) ? 1 : 0))
+	    (1 << ((x) & 7))) ? 1 : 0))
 
 #if 0
 bit