[libc++] Fix realloc bug in ios.cpp (#177526) When realloc fails in the function register_callback in `ios.cpp`, the memory will be leaked, then `__fn_` is assigned as `nullptr`, dereferencing `__fn_` causes UB. The fix is quite simple which aligns to `iword & pword` for `realloc`, i.e. return directly if `realloc` fails. Regarding testing for this bug fix, because `realloc` is a C function that we can't replace, there is no way to exercise that path easily.
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