Fix libpng compilation warning (#757)

According to the reported issue this warning appears when using
gcc 13.1.0 (rev7, MinGW-W64).

it's very likely a new warning and a false positive because the
buffer is used as an output parameter, but anyway.

1 files changed, 2 insertions, 2 deletions

diff --git a/png/pngerror.c b/png/pngerror.c
index ec3a709b9..be324458d 100644
--- a/png/pngerror.c
+++ b/png/pngerror.c
@@ -255,7 +255,7 @@ void
 png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
     png_alloc_size_t value)
 {
-   char buffer[PNG_NUMBER_BUFFER_SIZE];
+   char buffer[PNG_NUMBER_BUFFER_SIZE] = {0}; /* FLTK Issue #757 */
    png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
 }
 
@@ -265,7 +265,7 @@ png_warning_parameter_signed(png_warning_parameters p, int number, int format,
 {
    png_alloc_size_t u;
    png_charp str;
-   char buffer[PNG_NUMBER_BUFFER_SIZE];
+   char buffer[PNG_NUMBER_BUFFER_SIZE] = {0}; /* FLTK Issue #757 */
 
    /* Avoid overflow by doing the negate in a png_alloc_size_t: */
    u = (png_alloc_size_t)value;