migration: Remove unneeded NULL check from migrate_fd_error()
All the callers of migrate_fd_error() pass a non-NULL error parameter, and if any did pass NULL then we would segfault in error_copy(), so remove the unnecessary NULL check earlier in the function. (Spotted by Coverity.) Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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