[PATCH 5/7] xen/efi: Make efi_start() compile at -Og

[Andrew Cooper <andrew.cooper3@citrix.com>]

When compiling at -Og:

  boot.c: In function 'efi_start':
  boot.c:1339:9: error: 'argc' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   1339 |         efi_arch_handle_cmdline(argc ? *argv : NULL, options, name.s);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

although this appears to be limited to the ARM build only.  It also seems to
be bogus, because it is immediately preceding by a read of argc which doesn't
yield a diagnostic.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
---
 xen/common/efi/boot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 63e289ab85..f1e7a5267c 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -1126,7 +1126,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
     static EFI_GUID __initdata shim_lock_guid = SHIM_LOCK_PROTOCOL_GUID;
     EFI_LOADED_IMAGE *loaded_image;
     EFI_STATUS status;
-    unsigned int i, argc;
+    unsigned int i, argc = 0;
     CHAR16 **argv, *file_name, *cfg_file_name = NULL, *options = NULL;
     UINTN gop_mode = ~0;
     EFI_SHIM_LOCK_PROTOCOL *shim_lock;
-- 
2.11.0