ext4: delete unnecessary checks before brelse()

The brelse() function tests whether its argument is NULL
and then returns immediately.
Thus remove the tests which are not needed around the shown calls.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/0d713702-072f-a89c-20ec-ca70aa83a432@web.deSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/extents.c

@@ -693,11 +693,9 @@ void ext4_ext_drop_refs(struct ext4_ext_path *path)
 		return;
 	depth = path->p_depth;
 	for (i = 0; i <= depth; i++, path++) {
-		if (path->p_bh) {
 		brelse(path->p_bh);
 		path->p_bh = NULL;
 	}
-	}
 }
 
 /*

fs/ext4/xattr.c

@@ -1356,7 +1356,6 @@ static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode,
 
 	block = 0;
 	while (wsize < bufsize) {
-		if (bh != NULL)
 		brelse(bh);
 		csize = (bufsize - wsize) > blocksize ? blocksize :
 								bufsize - wsize;