here are the warning changes for luatexdir/pdf/*.c

source/texk/web2c/luatexdir/pdf/pdfcolorstack.c

source/texk/web2c/luatexdir/pdf/pdfdest.c

source/texk/web2c/luatexdir/pdf/pdfdest.h

source/texk/web2c/luatexdir/pdf/pdfgen.c

source/texk/web2c/luatexdir/pdf/pdfgen.h

source/texk/web2c/luatexdir/pdf/pdfglyph.c

source/texk/web2c/luatexdir/pdf/pdfimage.c

source/texk/web2c/luatexdir/pdf/pdflistout.c

source/texk/web2c/luatexdir/pdf/pdflistout.h

source/texk/web2c/luatexdir/pdf/pdfliteral.c

source/texk/web2c/luatexdir/pdf/pdfsaverestore.c

source/texk/web2c/luatexdir/pdf/pdfsetmatrix.c

source/texk/web2c/luatexdir/pdf/pdftables.c