libstagefright/matroska: Fix build with gcc 4.7

gcc 4.7 doesn't like the redefinition of i in the
same scope

Change-Id: Idf1b33af7041f0302f2f2562442a3e11ce9607d9
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
1 file changed