migration/multifd: Remove MultiFDPages_t::packet_num

This was introduced by commit 34c55a94b1 ("migration: Create multipage
support") and never used.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240104142144.9680-2-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>

migration/multifd.c

diff --git a/migration/multifd.c b/migration/multifd.c
index 9f353ae..3e650f5 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -250,7 +250,6 @@
 {
     pages->num = 0;
     pages->allocated = 0;
-    pages->packet_num = 0;
     pages->block = NULL;
     g_free(pages->offset);
     pages->offset = NULL;

migration/multifd.h

diff --git a/migration/multifd.h b/migration/multifd.h
index a835643..b0ff610 100644
--- a/migration/multifd.h
+++ b/migration/multifd.h
@@ -58,8 +58,6 @@
     uint32_t num;
     /* number of allocated pages */
     uint32_t allocated;
-    /* global number of generated multifd packets */
-    uint64_t packet_num;
     /* offset of each page */
     ram_addr_t *offset;
     RAMBlock *block;