treewide: Fix comment and string typo 'bufer'

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
index 476c65a..32adb73 100644
--- a/lib/decompress_unlzma.c
+++ b/lib/decompress_unlzma.c
@@ -562,7 +562,7 @@
 	else
 		inbuf = malloc(LZMA_IOBUF_SIZE);
 	if (!inbuf) {
-		error("Could not allocate input bufer");
+		error("Could not allocate input buffer");
 		goto exit_0;
 	}