dump: change cpu_get_note_size to return ssize_t

So that it can use the same prototype in both cases.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-i386/arch_dump.c b/target-i386/arch_dump.c
index 135d855..7c2b514 100644
--- a/target-i386/arch_dump.c
+++ b/target-i386/arch_dump.c
@@ -415,7 +415,7 @@
     return 0;
 }
 
-size_t cpu_get_note_size(int class, int machine, int nr_cpus)
+ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 {
     int name_size = 5; /* "CORE" or "QEMU" */
     size_t elf_note_size = 0;