Commit 1db4ec6e63 added a new pane_current_command format using
osdep_get_name(), which allocates. So we need to free the result
after using it.

Thanks,

diff --git a/format.c b/format.c
index ad52cae..b711111 100644
--- a/format.c
+++ b/format.c
@@ -398,7 +398,8 @@ format_window_pane(struct format_tree *ft, struct 
window_pane *wp)
        struct grid_line        *gl;
        unsigned long long       size;
        u_int                    i, idx;
-       const char              *cwd, *cmd;
+       const char              *cwd;
+       char                    *cmd;
 
        size = 0;
        for (i = 0; i < gd->hsize; i++) {
@@ -432,8 +433,10 @@ format_window_pane(struct format_tree *ft, struct 
window_pane *wp)
                format_add(ft, "pane_start_path", "%s", wp->cwd);
        if ((cwd = osdep_get_cwd(wp->fd)) != NULL)
                format_add(ft, "pane_current_path", "%s", cwd);
-       if ((cmd = osdep_get_name(wp->fd, wp->tty)) != NULL)
+       if ((cmd = osdep_get_name(wp->fd, wp->tty)) != NULL) {
                format_add(ft, "pane_current_command", "%s", cmd);
+               free(cmd);
+       }
 
        format_add(ft, "cursor_x", "%d", wp->base.cx);
        format_add(ft, "cursor_y", "%d", wp->base.cy);

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