BUG/MINOR: ssl/ocsp: check chunk_strcpy() in ssl_ocsp_get_uri_from_cert()

Check the return value of chunk_strcpy() in
ssl_ocsp_get_uri_from_cert().

Should fix issue #1975.
diff --git a/src/ssl_ocsp.c b/src/ssl_ocsp.c
index 901b396..0f59325 100644
--- a/src/ssl_ocsp.c
+++ b/src/ssl_ocsp.c
@@ -590,7 +590,10 @@
 		goto end;
 	}
 
-	chunk_strcpy(out, sk_OPENSSL_STRING_value(ocsp_uri_stk, 0));
+	if (!chunk_strcpy(out, sk_OPENSSL_STRING_value(ocsp_uri_stk, 0))) {
+		memprintf(err, "%sOCSP URI too long!\n", *err ? *err : "");
+		goto end;
+	}
 	if (b_data(out) == 0) {
 		memprintf(err, "%sNo OCSP URL!\n", *err ? *err : "");
 		goto end;