[PATCH] x86/vdso: avoid warning when building vdso2c on 32-bit host

[Jan Beulich]

size_t arguments can't compatibly be passed for l-modifier format
specifiers. Use z instead.

Fixes: 8382c668ce4f ("x86/vdso: Add support for exception fixup in vDSO 
functions")
Signed-off-by: Jan Beulich <jbeul...@suse.com>

--- a/arch/x86/entry/vdso/vdso2c.h
+++ b/arch/x86/entry/vdso/vdso2c.h
@@ -35,7 +35,7 @@ static void BITSFUNC(extract)(const unsi
        if (offset + len > data_len)
                fail("section to extract overruns input data");
 
-       fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
+       fprintf(outfile, "static const unsigned char %s[%zu] = {", name, len);
        BITSFUNC(copy)(outfile, data + offset, len);
        fprintf(outfile, "\n};\n\n");
 }