nss: improve error handling in Curl_nss_random()
The vtls layer now checks the return value, so it is no longer necessary to abort if a random number cannot be provided by NSS. This also fixes the following Coverity report: Error: FORWARD_NULL (CWE-476): lib/vtls/nss.c:1918: var_compare_op: Comparing "data" to null implies that "data" might be null. lib/vtls/nss.c:1923: var_deref_model: Passing null pointer "data" to "Curl_failf", which dereferences it. lib/sendf.c:154:3: deref_parm: Directly dereferencing parameter "data".
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0409a7d9
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