Fix -Wpointer-bool-conversion violation
Summary:
Fixing warning exposed by -Wpointer-bool-conversion
```
folly/container/test/F14MapTest.cpp:1370:35: error: address of function 'Tracked<0>::counts' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
<< "key_type ops " << Tracked<0>::counts << ", mapped_type ops "
~~ ^~~~~~~~~~~~~~~~~~
folly/container/test/F14MapTest.cpp:1370:35: note: prefix with the address-of operator to silence this warning
<< "key_type ops " << Tracked<0>::counts << ", mapped_type ops "
^
&
folly/container/test/F14MapTest.cpp:1371:16: error: address of function 'Tracked<1>::counts' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
<< Tracked<1>::counts;
~~ ^~~~~~~~~~~~~~~~~~
folly/container/test/F14MapTest.cpp:1371:16: note: prefix with the address-of operator to silence this warning
<< Tracked<1>::counts;
^
&
2 errors generated.
Reviewed By: yfeldblum
Differential Revision: D19131722
fbshipit-source-id: 9db48848ab5d68bc73ab0d6a4ef557d0db05414e
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