[devel] Changes to remove gcc warnings (John Bowler)

Certain optional gcc warning flags resulted in warnings in libpng code.
With these changes only -Wconversion and -Wcast-qual cannot be turned on.
Changes are trivial rearrangements of code.  -Wconversion is not possible
for pngrutil.c (because of the widespread use of += et al on variables
smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
with pngwio.c and pngwutil.c because the 'write' callback and zlib
compression both fail to declare their input buffers with 'const'.

1 files changed, 3 insertions, 0 deletions

diff --git a/pngwtran.c b/pngwtran.c
index 066e1e2c9..1765ef89d 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -220,6 +220,9 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 
             break;
          }
+
+         default:
+            break;
       }
 
       row_info->bit_depth = (png_byte)bit_depth;