nfsd: Remove duplicate macro define for max sec label length

NFS4_MAXLABELLEN has defined for sec label max length, use it directly.
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4proc.c

@@ -1815,7 +1815,7 @@ static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
 	}
 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
-		ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
+		ret += NFS4_MAXLABELLEN + 12;
 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
 	}
 	/*

fs/nfsd/nfs4xdr.c

@@ -424,7 +424,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		len += 4;
 		dummy32 = be32_to_cpup(p++);
 		READ_BUF(dummy32);
-		if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
+		if (dummy32 > NFS4_MAXLABELLEN)
 			return nfserr_badlabel;
 		len += (XDR_QUADLEN(dummy32) << 2);
 		READMEM(buf, dummy32);

fs/nfsd/xdr4.h

@@ -40,7 +40,6 @@
 #include "state.h"
 #include "nfsd.h"
 
-#define NFSD4_MAX_SEC_LABEL_LEN	2048
 #define NFSD4_MAX_TAGLEN	128
 #define XDR_LEN(n)                     (((n) + 3) & ~3)