[PATCH] x86/PV: make mmio_ro_emulated_write() static

[Jan Beulich]

It being non-static and it not having a declaration (anymore) violates
one or more Misra rules, iirc.

Fixes: ff3e5dfa7c2d ("x86/mm: move mmio_ro_emulated_write() to PV only file")
Signed-off-by: Jan Beulich <jbeul...@suse.com>

--- a/xen/arch/x86/pv/ro-page-fault.c
+++ b/xen/arch/x86/pv/ro-page-fault.c
@@ -337,7 +337,7 @@ static int cf_check mmcfg_intercept_writ
     return X86EMUL_OKAY;
 }
 
-int cf_check mmio_ro_emulated_write(
+static int cf_check mmio_ro_emulated_write(
     enum x86_segment seg,
     unsigned long offset,
     void *p_data,