patch 9.1.1724: Compiler warning about ununitialized variable in ex_docmd.

Problem:  Compiler warning about ununitialized variable in ex_docmd.
Solution: Initialize result variable (mityu)

Silence uninitialized variable warning produced by clang 21.1.0

closes: #18182

Signed-off-by: mityu <mityu.mail@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/ex_docmd.c

@@ -9773,7 +9773,7 @@ eval_vars(
 {
     int		i;
     char_u	*s;
-    char_u	*result;
+    char_u	*result = (char_u *)"";
     char_u	*resultbuf = NULL;
     size_t	resultlen;
     buf_T	*buf;
@@ -10064,10 +10064,6 @@ eval_vars(
 #endif
 		break;
 #endif
-
-	default:
-		result = (char_u *)""; // avoid gcc warning
-		break;
 	}
 
 	resultlen = STRLEN(result);	// length of new string

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1724,
 /**/
     1723,
 /**/