test1554: improve the error handling

tests/libtest/lib1554.c

@@ -51,6 +51,12 @@ int test(char *URL)
   global_init(CURL_GLOBAL_ALL);
 
   share = curl_share_init();
+  if(!share) {
+    fprintf(stderr, "curl_share_init() failed\n");
+    curl_global_cleanup();
+    return TEST_ERR_MAJOR_BAD;
+  }
+
   curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
   curl_share_setopt(share, CURLSHOPT_LOCKFUNC, my_lock);
   curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, my_unlock);