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block/curl.c: Set error message string if curl_init_state() fails
In curl_open(), the 'out' label assumes that the state->errmsg string has been set (either by curl_easy_perform() or by manually copying a string into it); however if curl_init_state() fails we will jump to that label without setting the string. Add the missing error string setup. (We can't be specific about the cause of failure: the documentation of curl_easy_init() just says "If this function returns NULL, something went wrong".) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20220222152341.850419-2-peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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