SSL: error messages style.

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 43d6fa2..79313c8 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1076,14 +1076,14 @@
     nid = OBJ_sn2nid((const char *) name->data);
     if (nid == 0) {
         ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
-                      "Unknown curve name \"%s\"", name->data);
+                      "OBJ_sn2nid(\"%s\") failed: unknown curve", name->data);
         return NGX_ERROR;
     }
 
     ecdh = EC_KEY_new_by_curve_name(nid);
     if (ecdh == NULL) {
         ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
-                      "Unable to create curve \"%s\"", name->data);
+                      "EC_KEY_new_by_curve_name(\"%s\") failed", name->data);
         return NGX_ERROR;
     }