#2 fix compile- init_windows without a prototype / null pointer

[Nico P]

Fix unprototyped function

ckpass.c:101:14: error: passing arguments to 'init_windows' without a prototype
      is deprecated in all versions of C and is not supported in C2x
      [-Werror,-Wdeprecated-non-prototype]

--- a/ckpass.h
+++ b/ckpass.h
@@ -56,7 +56,7 @@ void error_dialog(char *s);
 int open_db(kpass_db *db, const char *filename);
 int read_db(kpass_db *db, const char *filename);
 int decrypt_db(kpass_db *db, const char *password);
-void init_windows();
+void init_windows(const kpass_db *db);
 void draw_groups(const kpass_db *, int, int, bool);
 void draw_entries(const kpass_db *, int, int, int, bool, bool);
 void draw_top_bar(const char *);

[Nico P]

sentinel needs a pointer, use NULL defined ((void *)0) in gcc or clang

ckpass.c: In function ‘pipeout’:
ckpass.c:681:17: warning: missing sentinel in function call [-Wformat=]
  681 |                 execl(command, command, 0);
      |                 ^~~~~

--- a/ckpass.c
+++ b/ckpass.c
@@ -677,7 +677,7 @@ int pipeout(const char *command, const char *s)
                close(pipefd[1]); /* Close write end. */
                dup2(pipefd[0], 0); /* Dup read end to stdin. */


-               execl(command, command, 0);
+               execl(command, command, NULL);

                /* I don't really think these are necessary, but just in case. */
                close(pipefd[0]);