[PATCH] ArmPlatformPkg: eliminate Juno gcc build warning

[Leif Lindholm <leif.lindholm@linaro.org>]

When building without LTO, gcc incorrectly resolves the hazards for
'PciRegBase’ when inlining, leading to "may be used uninitialized"
warnings (and hence build failure with -Werror).
Eliminate this warning by explicitly initializing the variable to 0.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---

For those who have heard me mentioning this before but arguing against
upstreaming this patch: I only just tweaked that this warning doesn't
go away with more recent toolchains, but simply when switching to GCC5
build profile, and hence LTO. Build failure still reproducible with
gcc 6.3.1 and GCC49.

 ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c b/ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c
index da93eb5829..18491c7378 100644
--- a/ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c
+++ b/ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c
@@ -343,6 +343,7 @@ ArmJunoSetNicMacAddress ()
     return Status;
   }
 
+  PciRegBase = 0;
   Status = InitPciDev (PciIo, &PciRegBase, &OldPciAttr);
   if (EFI_ERROR (Status)) {
     return Status;
-- 
2.11.0