test/partial_idct_test: fix formatting and a warning
test/partial_idct_test: fix formatting and a warning

test/partial_idct_test.cc:74:5: warning: variable 'size' is
used uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
    ASSERT_TRUE(0) << "Wrong Size!";

Change-Id: Ic2f880ae09268561c9f036b4d6de220fde6dc5c4

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