fix walMain.c compile warning.

src/vnode/wal/src/walMain.c

@@ -125,7 +125,7 @@ int walRenew(twal_h handle) {
 
     if (pWal->num > pWal->max) {
       // remove the oldest wal file
-      char name[TSDB_FILENAME_LEN];
+      char name[TSDB_FILENAME_LEN * 3];
       sprintf(name, "%s/%s%d", pWal->path, walPrefix, pWal->id - pWal->max);
       if (remove(name) <0) {
         wError("wal:%s, failed to remove(%s)", name, strerror(errno));
@@ -177,7 +177,7 @@ int walRestore(void *handle, void *pVnode, int (*writeFp)(void *, SWalHead *, in
   uint32_t maxId = 0, minId = -1, index =0;
 
   int   plen = strlen(walPrefix);
-  char  opath[TSDB_FILENAME_LEN];
+  char  opath[TSDB_FILENAME_LEN+5];
   sprintf(opath, "%s/old", pWal->path);
 
   // is there old directory?
@@ -294,8 +294,8 @@ static int walRestoreWalFile(char *name, void *pVnode, int (*writeFp)(void *, SW
 
 int walHandleExistingFiles(char *path) {
   int    code = 0;
-  char   oname[TSDB_FILENAME_LEN];
-  char   nname[TSDB_FILENAME_LEN];
+  char   oname[TSDB_FILENAME_LEN * 3];
+  char   nname[TSDB_FILENAME_LEN * 3];
   char   opath[TSDB_FILENAME_LEN];
 
   sprintf(opath, "%s/old", path);
@@ -336,7 +336,7 @@ int walHandleExistingFiles(char *path) {
 
 static int walRemoveWalFiles(char *path) {
   int    plen = strlen(walPrefix);
-  char   name[TSDB_FILENAME_LEN];
+  char   name[TSDB_FILENAME_LEN * 3];
   int    code = 0;
 
   if (access(path, F_OK) != 0) return 0;