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libbufferhub: Fix compiler warning with printf format mismatch
std::vector<bool>::at() does not return bool& but a special reference
proxy class. Passing this class on the stack for "%d" printf specifier
is unsafe.
Compiler throws a warning to indicate this problem:
format specifies type 'int' but the argument has type 'reference'
(aka '__bit_reference<std::__1::vector<bool, std::__1::allocator<bool>>>')
Fixed by explicitly casting to int before pushing the value onto the stack.
Bug: None
Test: `m -j32` = no more warning
Change-Id: I7b3bc4908e4932c25be60fc350e0e0b439842b66