Created new error return macro: SMB_ERR_DAT_LEN.

src/smblib/smbdefs.h

@@ -131,6 +131,7 @@
 #define SMB_ERR_HDR_FIELD	-105		/* Missing header field */
 #define SMB_ERR_NOT_FOUND	-110		/* Item not found */
 #define SMB_ERR_DAT_OFFSET	-120		/* Invalid data offset (>2GB) */
+#define SMB_ERR_DAT_LEN		-121		/* Invalid data length (>2GB) */
 #define SMB_ERR_OPEN		-200		/* File open error */
 #define SMB_ERR_SEEK		-201		/* File seek/setpos error */
 #define SMB_ERR_LOCK		-202		/* File lock error */