Add NULL check after call "s = JLI_WildcardExpandClasspath(s);"

src/java.base/share/native/libjli/java.c

@@ -1018,23 +1018,16 @@ SetClassPath(const char *s)
     if (s == NULL)
         return;
     s = JLI_WildcardExpandClasspath(s);
+    if (s == NULL)
+        return;
     if (sizeof(format) - 2 + JLI_StrLen(s) < JLI_StrLen(s))
         // s is became corrupted after expanding wildcards
         return;
     size_t defSize = sizeof(format)
                        - 2 /* strlen("%s") */
                        + JLI_StrLen(s);
     def = JLI_MemAlloc(defSize);
-#if !defined(__clang_major__) && (__GNUC__ >= 7) && defined(__linux__)
-_Pragma("GCC diagnostic push")
-// Disable -Wstringop-overread which is introduced in GCC 7.
-// https://gcc.gnu.org/gcc-7/changes.html
-_Pragma("GCC diagnostic ignored \"-Wformat-truncation\"")
     snprintf(def, defSize, format, s);
-_Pragma("GCC diagnostic pop")
-#else
-    snprintf(def, defSize, format, s);
-#endif
     AddOption(def, NULL);
     if (s != orig)
         JLI_MemFree((char *) s);