minor fixes in the NGX_LUA_ABORT_AT_PANIC macro.

Author: agentzh

src/ngx_http_lua_exception.c

@@ -30,7 +30,7 @@ jmp_buf ngx_http_lua_exception;
 int
 ngx_http_lua_atpanic(lua_State *L)
 {
-#if (NGX_LUA_ABORT_AT_PANIC)
+#ifdef NGX_LUA_ABORT_AT_PANIC
     abort();
 #else
     u_char                  *s = NULL;
@@ -50,9 +50,9 @@ ngx_http_lua_atpanic(lua_State *L)
 
     /*  restore nginx execution */
     NGX_LUA_EXCEPTION_THROW(1);
-#endif
 
     /* impossible to reach here */
+#endif
 }
 
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