meta: Move loop variable declaration outside loop.

meta: Move loop variable declaration outside loop.

Fixes MSVC build error introduced with commit
69b258cb4636315b4c1aaaceeedd1eed8af98ba8.

meta.c(618) : error C2143: syntax error : missing ';' before 'type'
meta.c(618) : error C2143: syntax error : missing ')' before 'type'
meta.c(618) : error C2065: 'i' : undeclared identifier
meta.c(618) : warning C4552: '<' : operator has no effect; expected operator with side-effect
meta.c(618) : error C2059: syntax error : ')'
meta.c(618) : error C2143: syntax error : missing ';' before '{'
meta.c(619) : error C2065: 'i' : undeclared identifier
meta.c(620) : error C2065: 'i' : undeclared identifier

Signed-off-by: Vinson Lee <vlee@freedesktop.org>