Fix miscellaneous gcc -Wall warnings

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index c4da2a2..1ed8615 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -39,7 +39,7 @@
 
 extern ss_request_table debug_cmds;
 ss_request_table *extra_cmds;
-char *debug_prog_name;
+const char *debug_prog_name;
 
 ext2_filsys	current_fs = NULL;
 ext2_ino_t	root, cwd;
diff --git a/debugfs/logdump.c b/debugfs/logdump.c
index cf3aae6..08e58f7 100644
--- a/debugfs/logdump.c
+++ b/debugfs/logdump.c
@@ -366,7 +366,7 @@
 			fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 			fprintf(out_file, "\tblocksize=%d\n", blocksize);
 			fprintf(out_file, "\tjournal data size %lu\n",
-				sb->s_blocks_count);
+				(unsigned long) sb->s_blocks_count);
 		}
 	}
 	
diff --git a/debugfs/util.c b/debugfs/util.c
index cb84bd2..9ac570e 100644
--- a/debugfs/util.c
+++ b/debugfs/util.c
@@ -121,7 +121,7 @@
 
 	retval = ext2fs_namei(current_fs, root, cwd, str, &ino);
 	if (retval) {
-		com_err(str, retval, "");
+		com_err(str, retval, 0);
 		return 0;
 	}
 	return ino;