bdfReadBitmap: avoid access to byte before start of array

Clears 4 -Wanalyzer-out-of-bounds warnings from gcc 14.1

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/util/bdftopcf/-/merge_requests/7>

1 files changed, 1 insertions, 1 deletions

diff --git a/bdfread.c b/bdfread.c
index feaf15c..c1e5d06 100644
--- a/bdfread.c
+++ b/bdfread.c
@@ -152,7 +152,7 @@ bdfReadBitmap(CharInfoPtr pCI, FontFilePtr file, int bit, int byte,
             for (i = widthHexChars - inLineLen; i > 0; i--)
                 picture[nextByte++] = 0;
         }
-        else {
+        else if (nextByte > 0) {
             unsigned char mask;
 
             mask = 0xff << (8 - (widthBits & 0x7));