maint: remove redundant usage declarations (-Wredundant-decls)

* src/csplit.c (usage): Remove declaration.
* src/ls.c (usage): Likewise.
* src/pr.c (usage): Likewise.

3 files changed, 0 insertions, 3 deletions

diff --git a/src/csplit.c b/src/csplit.c
index 5d84c4580..49ef3db81 100644
--- a/src/csplit.c
+++ b/src/csplit.c
@@ -111,7 +111,6 @@ static void close_output_file (void);
 static void create_output_file (void);
 static void delete_all_files (bool);
 static void save_line_to_file (const struct cstring *line);
-void usage (int status);
 
 /* Start of buffer list. */
 static struct buffer_record *head = NULL;
diff --git a/src/ls.c b/src/ls.c
index 96f7c987b..8be9b6aed 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -282,7 +282,6 @@ static void queue_directory (char const *name, char const *realname,
                              bool command_line_arg);
 static void sort_files (void);
 static void parse_ls_color (void);
-void usage (int status);
 
 /* Initial size of hash table.
    Most hierarchies are likely to be shallower than this.  */
diff --git a/src/pr.c b/src/pr.c
index d1adc5591..395e1e317 100644
--- a/src/pr.c
+++ b/src/pr.c
@@ -426,7 +426,6 @@ static void pad_across_to (int position);
 static void add_line_number (COLUMN *p);
 static void getoptarg (char *arg, char switch_char, char *character,
                        int *number);
-void usage (int status);
 static void print_files (int number_of_files, char **av);
 static void init_parameters (int number_of_files);
 static void init_header (char const *filename, int desc);