patch 8.2.2907: memory leak when running out of memory

Problem:    Memory leak when running out of memory.
Solution:   Free the allocated memory. (Dominique Pellé, closes #8284)

src/term.c

@@ -4248,6 +4248,7 @@ add_termcode(char_u *name, char_u *string, int flags)
 	if (new_tc == NULL)
 	{
 	    tc_max_len -= 20;
+	    vim_free(s);
 	    return;
 	}
 	for (i = 0; i < tc_len; ++i)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2907,
 /**/
     2906,
 /**/