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fix -Wreturn-std-move errors
Summary: This was exposed by the latest clang with -Wreturn-std-move enabled: ```lang=bash folly/FBString.h:2487:12: error: local variable 'rhs' will be copied despite being returned by name [-Werror,-Wreturn-std-move] return rhs; ^~~ folly/test/FBStringTest.cpp:1294:23: note: in instantiation of function template specialization 'folly::operator+<char, std::char_traits<char>, std::allocator<char>, folly::fbstring_core<char> >' requested here auto test1 = '\0' + std::move(s1); ^ folly/FBString.h:2487:12: note: call 'std::move' explicitly to avoid copying return rhs; ^~~ std::move(rhs) 2 errors generated. ``` Reviewed By: Orvid Differential Revision: D7776805 fbshipit-source-id: f11ae5a1fc416b8838b8ea74d7f6b488f07cab38
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