patch 7.4.972

Problem:    Memory leak when there is an error in setting an option.
Solution:   Free the saved value (Christian Brabandt)

src/option.c

@@ -4970,7 +4970,12 @@ do_set(arg, opt_flags)
 
 			/* If error detected, print the error message. */
 			if (errmsg != NULL)
+			{
+#if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
+			    vim_free(saved_origval);
+#endif
 			    goto skip;
+			}
 #if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
 			if (saved_origval != NULL)
 			{

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    972,
 /**/
     971,
 /**/