*: introduce and use ffulsh_all()

function                                             old     new   delta
buffer_fill_and_print                                179     196     +17
fflush_all                                             -       9      +9
spawn                                                 87      92      +5
rtcwake_main                                         455     453      -2
...
alarm_intr                                            93      84      -9
readcmd                                             1072    1062     -10
bb_ask                                               345     333     -12
more_main                                            845     832     -13
flush_stdout_stderr                                   42      23     -19
xfflush_stdout                                        27       -     -27
flush_stderr                                          30       -     -30
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/50 up/down: 31/-397)         Total: -366 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/editors/vi.c b/editors/vi.c
index 82f302d..1a3997a 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2136,7 +2136,7 @@
 
 static void cookmode(void)
 {
-	fflush(stdout);
+	fflush_all();
 	tcsetattr_stdin_TCSANOW(&term_orig);
 }
 
@@ -2201,7 +2201,7 @@
 {
 	int c;
 
-	fflush(stdout);
+	fflush_all();
 	c = read_key(STDIN_FILENO, readbuffer);
 	if (c == -1) { // EOF/error
 		go_bottom_and_clear_to_eol();
@@ -2555,7 +2555,7 @@
 		}
 		place_cursor(crow, ccol, FALSE);	// put cursor back in correct place
 	}
-	fflush(stdout);
+	fflush_all();
 }
 
 //----- format the status buffer, the bottom line of screen ------
@@ -3963,7 +3963,7 @@
 	if (msg[0]) {
 		printf("\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s",
 			totalcmds, last_input_char, msg, SOs, SOn);
-		fflush(stdout);
+		fflush_all();
 		while (safe_read(STDIN_FILENO, d, 1) > 0) {
 			if (d[0] == '\n' || d[0] == '\r')
 				break;