[CIFS] CIFSSMBPosixLock should return -EINVAL on error

all other codepaths in this function return negative values on errors

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifssmb.c

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 641cc8f..1cbe615 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1767,7 +1767,7 @@
 	cFYI(1, ("Posix Lock"));
 
 	if (pLockData == NULL)
-		return EINVAL;
+		return -EINVAL;
 
 	rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);