orangefs: remove redundant assignment to variable buffer_index

The variable buffer_index is being initialized however this is never
read and later it is being reassigned to a new value. The initialization
is redundant and hence can be removed.

Addresses-Coverity: ("Unused Value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/file.c

@@ -52,7 +52,7 @@ ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inode,
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 	struct orangefs_kernel_op_s *new_op = NULL;
-	int buffer_index = -1;
+	int buffer_index;
 	ssize_t ret;
 	size_t copy_amount;