fix: A核告警消除

【背景】定期A核代码消除。

【修改方案】
1，根据工具扫描结果，对代码告警进行更改

【影响】
对现有的产品编译不会有影响。

re #I46KF6
Signed-off-by: Nwangchen <253227059@qq.com>

fs/proc/os_adapt/fd_proc.c

@@ -75,7 +75,7 @@ static void FillFdInfo(struct SeqBuf *seqBuf, struct filelist *fileList, unsigne
             }
 
             if (hasPrivilege) {
-                (void)LosBufPrintf(seqBuf, "%u\t%d\t%6d <%d>\t%s\n", pid, fd, sysFd, filp->f_refcount, name);
+                (void)LosBufPrintf(seqBuf, "%u\t%d\t%6d <%d>\t%s\n", pid, fd, sysFd, filp ? filp->f_refcount : 1, name);
             } else {
                 (void)LosBufPrintf(seqBuf, "%u\t%d\t%s\n", pid, fd, name);
             }

fs/vfs/operation/vfs_cloexec.c

@@ -50,7 +50,10 @@ void CloseOnExec(struct files_struct *files)
         if (FD_ISSET(i, files->fdt->proc_fds) &&
             FD_ISSET(i, files->fdt->cloexec_fds)) {
             sysFd = DisassociateProcessFd(i);
-            close(sysFd);
+            if (sysFd >= 0) {
+                close(sysFd);
+            }
+
             FreeProcessFd(i);
         }
     }

fs/vfs/operation/vfs_force_umount.c

@@ -265,6 +265,10 @@ static struct Mount* GetDevMountPoint(struct Vnode *dev)
 {
     struct Mount *mnt = NULL;
     LIST_HEAD *mntList = GetMountList();
+    if (mntList == NULL) {
+        return NULL;
+    }
+
     LOS_DL_LIST_FOR_EACH_ENTRY(mnt, mntList, struct Mount, mountList) {
         if (mnt->vnodeDev == dev) {
             return mnt;
@@ -302,7 +306,7 @@ static void FileDisableAndClean(struct Mount *mnt)
 {
     struct filelist *flist = &tg_filelist;
     struct file *filep = NULL;
-    const struct file_operations_vfs *originOps;
+    const struct file_operations_vfs *originOps = NULL;
 
     for (int i = 3; i < CONFIG_NFILE_DESCRIPTORS; i++) {
         if (!get_bit(i)) {
@@ -355,7 +359,7 @@ static void VnodeTryFreeAll(struct Mount *mount)
 int ForceUmountDev(struct Vnode *dev)
 {
     int ret;
-    struct Vnode *origin;
+    struct Vnode *origin = NULL;
     struct filelist *flist = &tg_filelist;
     if (dev == NULL) {
         return -EINVAL;