Dereference null return value

If the function actually returns a null value, a null pointer dereference will occur. Return value of function which returns null is dereferenced without checking
/ext/test/key_provider/key_provider.c:181: NULL_RETURNS 184210 "localtime" returns "NULL".
/ext/test/key_provider/key_provider.c:181: NULL_RETURNS 184210 Assigning: "tm_info" = "NULL" return value from "localtime".
/ext/test/key_provider/key_provider.c:182: NULL_RETURNS 184210 Passing null pointer "tm_info" to "strftime", which dereferences it.