[xen master] xen/arm: fix uninitialized use warning

[patchbot@xxxxxxx]

commit 3adcfbd316c9e82b2ad311450f21f330bfdc1f41
Author:     Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
AuthorDate: Fri Apr 14 14:57:14 2023 -0400
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Wed Apr 19 19:28:27 2023 +0100

    xen/arm: fix uninitialized use warning
    
    When building the hypervisor with -Og and GCC 11/12, we encounter the
    following error:
    
    arch/arm/domain_build.c: In function â??make_cpus_nodeâ??:
    arch/arm/domain_build.c:2040:12: error: â??clock_validâ?? may be used 
uninitialized [-Werror=maybe-uninitialized]
     2040 |         if ( clock_valid )
          |            ^
    arch/arm/domain_build.c:1947:10: note: â??clock_validâ?? was declared here
     1947 |     bool clock_valid;
          |          ^~~~~~~~~~~
    cc1: all warnings being treated as errors
    
    Fix it by initializing the variable.
    
    Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
    Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 4f9d4f9d88..f80fdd1af2 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1944,7 +1944,8 @@ static int __init make_cpus_node(const struct domain *d, 
void *fdt)
     /* Placeholder for cpu@ + a 32-bit hexadecimal number + \0 */
     char buf[13];
     u32 clock_frequency;
-    bool clock_valid;
+    /* Keep the compiler happy with -Og */
+    bool clock_valid = false;
     uint64_t mpidr_aff;
 
     dt_dprintk("Create cpus node\n");
--
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