x86emul: fold exit paths

Move "cannot_emulate" and make it go through the common (error) exit
path.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -7762,7 +7762,9 @@ x86_emulate(
     }
 
     default:
-        goto cannot_emulate;
+    cannot_emulate:
+        rc = X86EMUL_UNHANDLEABLE;
+        goto done;
     }
 
     if ( state->simd_size )
@@ -7906,11 +7908,6 @@ x86_emulate(
     _put_fpu();
     put_stub(stub);
     return rc;
-
- cannot_emulate:
-    _put_fpu();
-    put_stub(stub);
-    return X86EMUL_UNHANDLEABLE;
 #undef state
 }