[PATCH] exynos4210_gic: Suppress gcc9 format-truncation warnings

[David Gibson <david@gibson.dropbear.id.au>]

exynos4210_gic_realize() prints the number of cpus into some temporary
buffers, but it only allows 3 bytes space for it.  That's plenty - I'm
pretty sure that existing machines will only ever set this value to 2
(EXYNOS4210_NCPUS).  But the compiler can't really be expected to figure
that out.

Some[*] gcc9 versions therefore emit -Wformat-truncation warnings.  Fix
that by allowing more space in the temporary buffers - these are on stack
very briefly before being essentially strdup()ed inside the memory region
code, so there's not much cost to doing so.

[*] The bizarre thing here, is that I've long gotten these warnings
compiling in a 32-bit x86 container as host - Fedora 30 with
gcc-9.2.1-1.fc30.i686 - but it compiles just fine on my normal x86_64 host
- Fedora 30 with and gcc-9.2.1-1.fc30.x86_64.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/intc/exynos4210_gic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/intc/exynos4210_gic.c b/hw/intc/exynos4210_gic.c
index a1b699b6ba..2e5e47f9ec 100644
--- a/hw/intc/exynos4210_gic.c
+++ b/hw/intc/exynos4210_gic.c
@@ -290,8 +290,8 @@ static void exynos4210_gic_realize(DeviceState *dev, Error **errp)
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     const char cpu_prefix[] = "exynos4210-gic-alias_cpu";
     const char dist_prefix[] = "exynos4210-gic-alias_dist";
-    char cpu_alias_name[sizeof(cpu_prefix) + 3];
-    char dist_alias_name[sizeof(cpu_prefix) + 3];
+    char cpu_alias_name[sizeof(cpu_prefix) + 10];
+    char dist_alias_name[sizeof(cpu_prefix) + 10];
     SysBusDevice *gicbusdev;
     uint32_t i;
 
-- 
2.21.0