[PATCH 03/10] tools/libxg: Fix uninitialised variable in meminit()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Various version of gcc, when compiling with -Og, complain:

  xg_dom_arm.c: In function 'meminit':
  xg_dom_arm.c:420:19: error: 'p2m_size' may be used uninitialized in this 
function [-Werror=maybe-uninitialized]
    420 |     dom->p2m_size = p2m_size;
        |     ~~~~~~~~~~~~~~^~~~~~~~~~

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Ian Jackson <iwj@xxxxxxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien@xxxxxxx>

Julien/Stefano: I can't work out how this variable is supposed to work, and
the fact that it isn't a straight accumulation across the RAM banks looks
suspect.
---
 tools/libs/guest/xg_dom_arm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/guest/xg_dom_arm.c b/tools/libs/guest/xg_dom_arm.c
index 94948d2b20..f1b8d06f75 100644
--- a/tools/libs/guest/xg_dom_arm.c
+++ b/tools/libs/guest/xg_dom_arm.c
@@ -373,7 +373,7 @@ static int meminit(struct xc_dom_image *dom)
     const uint64_t modsize = dtb_size + ramdisk_size;
     const uint64_t ram128mb = bankbase[0] + (128<<20);
 
-    xen_pfn_t p2m_size;
+    xen_pfn_t p2m_size = 0;
     uint64_t bank0end;
 
     assert(dom->rambase_pfn << XC_PAGE_SHIFT == bankbase[0]);
-- 
2.11.0