tweaks: remove unneeded braces, and mark empty parameter list as void

This matches the style in the rest of the code.

src/prompt.c

@@ -137,9 +137,9 @@ int do_statusbar_input(bool *ran_func, bool *finished)
 				s->scfunc == do_delete ||
 				s->scfunc == do_backspace))
 	    ;
-	else if (s->scfunc == do_verbatim_input) {
+	else if (s->scfunc == do_verbatim_input)
 	    do_statusbar_verbatim_input();
-	} else if (s->scfunc == do_cut_text_void)
+	else if (s->scfunc == do_cut_text_void)
 	    do_statusbar_cut_text();
 	else if (s->scfunc == do_delete)
 	    do_statusbar_delete();

src/text.c

@@ -456,7 +456,7 @@ bool white_string(const char *s)
 
 #ifdef ENABLE_COMMENT
 /* Comment or uncomment the current line or the marked lines. */
-void do_comment()
+void do_comment(void)
 {
     const char *comment_seq = GENERAL_COMMENT_CHARACTER;
     undo_type action = UNCOMMENT;