fix：修复函数返回错误等问题

Signed-off-by: zhangdengyu <zhangdengyu2@huawei.com>

shell/full/src/base/shell_lk.c

@@ -145,7 +145,7 @@ INT32 CmdLog(INT32 argc, const CHAR **argv)
         }
     } else if (!strncmp(argv[0], "module", strlen(argv[0]) + 1)) {
         module = strtoul(argv[1], &p, 0);
-        if ((*p != 0) || (module > MODULE4) || (module < MODULE0)) {
+        if ((*p != 0) || (module > MODULE4) || (module == MODULE0)) {
             PRINTK("log %s can't access %s\n", argv[0], argv[1]);
             PRINTK("not support yet\n");
             return -1;

shell/full/src/base/shmsg.c

@@ -329,7 +329,7 @@ END:
 LITE_OS_SEC_TEXT_MINOR UINT32 ShellEntry(UINTPTR param)
 {
     CHAR ch;
-    INT32 n = 0;
+    INT32 n;
     ShellCB *shellCB = (ShellCB *)param;
 
     CONSOLE_CB *consoleCB = OsGetConsoleByID((INT32)shellCB->consoleID);

shell/full/src/cmds/dmesg.c

@@ -425,7 +425,7 @@ STATIC VOID OsBufFullWrite(const CHAR *dst, UINT32 logLen)
 
 STATIC VOID OsWriteTailToHead(const CHAR *dst, UINT32 logLen)
 {
-    UINT32 writeLen = 0;
+    UINT32 writeLen;
     UINT32 bufSize = g_logBufSize;
     UINT32 logSize = g_dmesgInfo->logSize;
     UINT32 tail = g_dmesgInfo->logTail;