btrfs: tests: use standard error message after inode allocation failure

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

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

@@ -73,7 +73,7 @@ static int test_find_delalloc(u32 sectorsize)
 
 	inode = btrfs_new_test_inode();
 	if (!inode) {
-		test_err("failed to allocate test inode");
+		test_std_err(TEST_ALLOC_INODE);
 		return -ENOMEM;
 	}
 

fs/btrfs/tests/inode-tests.c

@@ -228,7 +228,7 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
 
 	inode = btrfs_new_test_inode();
 	if (!inode) {
-		test_err("couldn't allocate inode");
+		test_std_err(TEST_ALLOC_INODE);
 		return ret;
 	}
 
@@ -829,7 +829,7 @@ static int test_hole_first(u32 sectorsize, u32 nodesize)
 
 	inode = btrfs_new_test_inode();
 	if (!inode) {
-		test_err("couldn't allocate inode");
+		test_std_err(TEST_ALLOC_INODE);
 		return ret;
 	}
 
@@ -929,7 +929,7 @@ static int test_extent_accounting(u32 sectorsize, u32 nodesize)
 
 	inode = btrfs_new_test_inode();
 	if (!inode) {
-		test_err("couldn't allocate inode");
+		test_std_err(TEST_ALLOC_INODE);
 		return ret;
 	}