exec: Fix CPU rework fallout

Commit 259186a7d2f7184efc96ae99bc5658e6159f53ad (cpu: Move halted and
interrupt_request fields to CPUState) passed CPUState::env_ptr to
tlb_flush() directory rather than through a typed variable.

Commit 00c8cb0a36f51a6866a83c08962d12a0eb21864b (cputlb: Change
tlb_flush() argument to CPUState) now changed the argument type.
This was unnoticed by gcc because env_ptr is a void pointer.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/exec.c b/exec.c
index 6a0bc94..91513c6 100644
--- a/exec.c
+++ b/exec.c
@@ -420,7 +420,7 @@
     /* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
        version_id is increased. */
     cpu->interrupt_request &= ~0x01;
-    tlb_flush(cpu->env_ptr, 1);
+    tlb_flush(cpu, 1);
 
     return 0;
 }