btrfs: fix message printing

Fix various messages to include newline and module prefix.

Signed-off-by: Daniel J Blueman <daniel@quora.org>
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index 92c2065..9acb846 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -97,7 +97,7 @@
 	*total_in = 0;
 
 	if (Z_OK != zlib_deflateInit(&workspace->def_strm, 3)) {
-		printk(KERN_WARNING "deflateInit failed\n");
+		printk(KERN_WARNING "btrfs: deflateInit failed\n");
 		ret = -1;
 		goto out;
 	}
@@ -125,7 +125,7 @@
 	while (workspace->def_strm.total_in < len) {
 		ret = zlib_deflate(&workspace->def_strm, Z_SYNC_FLUSH);
 		if (ret != Z_OK) {
-			printk(KERN_DEBUG "btrfs deflate in loop returned %d\n",
+			printk(KERN_DEBUG "btrfs: deflate in loop returned %d\n",
 			       ret);
 			zlib_deflateEnd(&workspace->def_strm);
 			ret = -1;
@@ -252,7 +252,7 @@
 	}
 
 	if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
-		printk(KERN_WARNING "inflateInit failed\n");
+		printk(KERN_WARNING "btrfs: inflateInit failed\n");
 		return -1;
 	}
 	while (workspace->inf_strm.total_in < srclen) {
@@ -336,7 +336,7 @@
 	}
 
 	if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
-		printk(KERN_WARNING "inflateInit failed\n");
+		printk(KERN_WARNING "btrfs: inflateInit failed\n");
 		return -1;
 	}