The ASAN build fails with
```
cookie_auth.c:62:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (cookie_header == NULL) goto clean;
^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:84:10: note: uninitialized use occurs here
return ret;
^~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
if (cookie_header == NULL) goto clean;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:65:3: note: variable 'ret' is declared here
struct session *ret = NULL;
^
cookie_auth.c:62:7: error: variable 'ssid' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (cookie_header == NULL) goto clean;
^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:81:7: note: uninitialized use occurs here
if (ssid != ssid_buf) {
^~~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
if (cookie_header == NULL) goto clean;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:64:3: note: variable 'ssid' is declared here
char *ssid = ssid_buf;
^
2 errors generated.
```
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