Fix some errors/warnings detected by nuttx/tools/testbuild.sh
diff --git a/examples/configdata/configdata_main.c b/examples/configdata/configdata_main.c
index 1f3047a..91aba25 100644
--- a/examples/configdata/configdata_main.c
+++ b/examples/configdata/configdata_main.c
@@ -169,6 +169,7 @@
  * Name: configdata_loopmemusage
  ****************************************************************************/
 
+#ifndef CONFIG_EXAMPLES_CONFIGDATA_SILENT
 static void configdata_loopmemusage(void)
 {
   /* Get the current memory usage */
@@ -192,6 +193,7 @@
   memcpy(&g_mmprevious, &g_mmafter, sizeof(struct mallinfo));
 #endif
 }
+#endif
 
 /****************************************************************************
  * Name: configdata_endmemusage
@@ -565,7 +567,7 @@
  * Name: configdata_cleardeleted
  ****************************************************************************/
 
-static int configdata_cleardeleted(void)
+static void configdata_cleardeleted(void)
 {
   int nextdeleted;
   int x;
diff --git a/examples/nxffs/nxffs_main.c b/examples/nxffs/nxffs_main.c
index ddc15ee..117af7c 100644
--- a/examples/nxffs/nxffs_main.c
+++ b/examples/nxffs/nxffs_main.c
@@ -660,7 +660,7 @@
         {
           /* Test for wrap-around */
 
-          if (j >= CONFIG_EXAMPLES_FSTEST_MAXOPEN)
+          if (j >= CONFIG_EXAMPLES_NXFFS_MAXOPEN)
             {
               j = 0;
             }