btrfs: tests: use standard error message after extent buffer allocation failure

Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tests/extent-buffer-tests.c

@@ -50,7 +50,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
 
 	path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info, nodesize);
 	if (!eb) {
-		test_err("could not allocate dummy buffer");
+		test_std_err(TEST_ALLOC_EXTENT_BUFFER);
 		ret = -ENOMEM;
 		goto out;
 	}

fs/btrfs/tests/extent-io-tests.c

@@ -406,7 +406,7 @@ static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
 
 	eb = __alloc_dummy_extent_buffer(fs_info, 0, len);
 	if (!eb) {
-		test_err("couldn't allocate test extent buffer");
+		test_std_err(TEST_ALLOC_ROOT);
 		ret = -ENOMEM;
 		goto out;
 	}
@@ -419,7 +419,7 @@ static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
 	free_extent_buffer(eb);
 	eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
 	if (!eb) {
-		test_err("couldn't allocate test extent buffer");
+		test_std_err(TEST_ALLOC_ROOT);
 		ret = -ENOMEM;
 		goto out;
 	}

fs/btrfs/tests/free-space-tree-tests.c

@@ -463,7 +463,7 @@ static int run_test(test_func_t test_func, int bitmaps, u32 sectorsize,
 
 	root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
 	if (!root->node) {
-		test_err("couldn't allocate dummy buffer");
+		test_std_err(TEST_ALLOC_EXTENT_BUFFER);
 		ret = -ENOMEM;
 		goto out;
 	}

fs/btrfs/tests/inode-tests.c

@@ -250,7 +250,7 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
 
 	root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 	if (!root->node) {
-		test_err("couldn't allocate dummy buffer");
+		test_std_err(TEST_ALLOC_ROOT);
 		goto out;
 	}
 
@@ -851,7 +851,7 @@ static int test_hole_first(u32 sectorsize, u32 nodesize)
 
 	root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 	if (!root->node) {
-		test_err("couldn't allocate dummy buffer");
+		test_std_err(TEST_ALLOC_ROOT);
 		goto out;
 	}