fs: Initialize fs_allmaps_s::exclsem in declaration directly

and then remove rammap_initialize and caller

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ife9f04d409b3a14a3be4bbb61c23da6e7a9f8a3d

fs/mmap/fs_munmap.c

@@ -103,7 +103,6 @@ int munmap(FAR void *start, size_t length)
 
   /* Find a region containing this start and length in the list of regions */
 
-  rammap_initialize();
   ret = nxsem_wait(&g_rammaps.exclsem);
   if (ret < 0)
     {

fs/mmap/fs_rammap.c

@@ -46,35 +46,15 @@
 
 /* This is the list of all mapped files */
 
-struct fs_allmaps_s g_rammaps;
+struct fs_allmaps_s g_rammaps =
+{
+  SEM_INITIALIZER(1)
+};
 
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: rammap_initialize
- *
- * Description:
- *   Verified that this capability has been initialized.
- *
- * Input Parameters:
- *   None
- *
- * Returned Value:
- *   None
- *
- ****************************************************************************/
-
-void rammap_initialize(void)
-{
-  if (!g_rammaps.initialized)
-    {
-      nxsem_init(&g_rammaps.exclsem, 0, 1);
-      g_rammaps.initialized = true;
-    }
-}
-
 /****************************************************************************
  * Name: rammmap
  *
@@ -197,7 +177,6 @@ FAR void *rammap(int fd, size_t length, off_t offset)
 
   /* Add the buffer to the list of regions */
 
-  rammap_initialize();
   ret = nxsem_wait(&g_rammaps.exclsem);
   if (ret < 0)
     {

fs/mmap/fs_rammap.h

@@ -65,7 +65,6 @@ struct fs_rammap_s
 
 struct fs_allmaps_s
 {
-  bool                initialized; /* True: This structure has been initialized */
   sem_t               exclsem;     /* Provides exclusive access the list */
   struct fs_rammap_s *head;        /* List of mapped files */
 };