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Eliminate signed division overhead in align()

Signed-off-by: Timothy B. Terriberry <[email protected]>

--- a/src/opus_private.h

+++ b/src/opus_private.h

@@ -114,7 +114,7 @@

 {

     struct foo {char c; union { void* p; opus_int32 i; opus_val32 v; } u;};

-    int alignment = offsetof(struct foo, u);

+    unsigned int alignment = offsetof(struct foo, u);

     /* Optimizing compilers should optimize div and multiply into and

        for all sensible alignment values. */