shmem: Explicitly initialize rst_shmems

This is a position in the RM_SHREMAP memory. Since shmems are currently
the only user of it, this is validly equals zero, but it will change soon.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -174,6 +174,9 @@ static int root_prepare_shared(void)
 	if (prepare_shared_reg_files())
 		return -1;
 
+	if (prepare_shmem_restore())
+		return -1;
+
 	for (i = 0; i < ARRAY_SIZE(cinfos); i++) {
 		ret = collect_image(cinfos[i]);
 		if (ret)

include/shmem.h

@@ -28,7 +28,7 @@ extern void show_saved_shmems(void);
 extern int get_shmem_fd(int pid, VmaEntry *vi);
 
 extern unsigned long nr_shmems;
-extern unsigned int rst_shmems;
+extern unsigned long rst_shmems;
 
 extern int cr_dump_shmem(void);
 extern int add_shmem_area(pid_t pid, VmaEntry *vma);

shmem.c

@@ -16,7 +16,13 @@
 #include "protobuf/pagemap.pb-c.h"
 
 unsigned long nr_shmems;
-unsigned int rst_shmems;
+unsigned long rst_shmems;
+
+int prepare_shmem_restore(void)
+{
+	rst_shmems = rst_mem_cpos(RM_SHREMAP);
+	return 0;
+}
 
 void show_saved_shmems(void)
 {