Allow user names longer than 32 bytes

We artificially limited the user name to 32 bytes, but modern servers handle
larger.  Set the maximum length to a reasonable 256, and make the user name
string dynamically allocated rather than a fixed size in session structure.
Also clean up old checkpatch warning.

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index 4dfba82..33d2213 100644
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -113,7 +113,7 @@
 		   MAX_MECH_STR_LEN +
 		   UID_KEY_LEN + (sizeof(uid_t) * 2) +
 		   CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
-		   USER_KEY_LEN + strlen(sesInfo->userName) +
+		   USER_KEY_LEN + strlen(sesInfo->user_name) +
 		   PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
 
 	spnego_key = ERR_PTR(-ENOMEM);
@@ -153,7 +153,7 @@
 	sprintf(dp, ";creduid=0x%x", sesInfo->cred_uid);
 
 	dp = description + strlen(description);
-	sprintf(dp, ";user=%s", sesInfo->userName);
+	sprintf(dp, ";user=%s", sesInfo->user_name);
 
 	dp = description + strlen(description);
 	sprintf(dp, ";pid=0x%x", current->pid);