e2image: fix flag settings in e2image.h

This prevents from SIGSEGV when -s options is used.

Signed-off-by: Tomas Racek <tracek@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
diff --git a/lib/ext2fs/e2image.h b/lib/ext2fs/e2image.h
index c918529..5537980 100644
--- a/lib/ext2fs/e2image.h
+++ b/lib/ext2fs/e2image.h
@@ -19,7 +19,7 @@
 /* Image flags */
 #define E2IMAGE_INSTALL_FLAG	1
 #define E2IMAGE_SCRAMBLE_FLAG	2
-#define E2IMAGE_IS_QCOW2_FLAG	3
+#define E2IMAGE_IS_QCOW2_FLAG	4
 
 struct ext2_image_hdr {
 	__u32	magic_number;	/* This must be EXT2_ET_MAGIC_E2IMAGE */