[xen master] xen/compiler: fix MISRA C 2012 Rule 20.7 violation

[patchbot@xxxxxxx]

commit 7177b2c3265a18722cd4a89542a28815f7b13622
Author:     Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
AuthorDate: Fri Aug 5 08:37:13 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 5 08:37:13 2022 +0200

    xen/compiler: fix MISRA C 2012 Rule 20.7 violation
    
    In __must_be_array(), the macro parameter 'a' is used as expression and
    therefore it is good to be enclosed in parentheses to prevent against
    unintended expansions.
    
    Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/xen/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index 933aec09a9..a563130334 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -123,7 +123,7 @@
 
 /* &a[0] degrades to a pointer: a different type from an array */
 #define __must_be_array(a) \
-  BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
+  BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&(a)[0])))
 
 #ifdef CONFIG_CC_HAS_VISIBILITY_ATTRIBUTE
 /* Results in more efficient PIC code (no indirections through GOT or PLT). */
--
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