perf tools: Fix split kallsyms DSO counting

[ Upstream commit ad0b9c4865b98dc37f4d606d26b1c19808796805 ]

It's counted twice as it's increased after calling maps__insert().  I
guess we want to increase it only after it's added properly.

Reviewed-by: Ian Rogers <irogers@google.com>
Fixes: 2e538c4a18 ("perf tools: Improve kernel/modules symbol lookup")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

tools/perf/util/symbol.c

@@ -905,11 +905,11 @@ static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 			if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
 				snprintf(dso_name, sizeof(dso_name),
 					"[guest.kernel].%d",
-					kernel_range++);
+					kernel_range);
 			else
 				snprintf(dso_name, sizeof(dso_name),
 					"[kernel].%d",
-					kernel_range++);
+					kernel_range);
 
 			ndso = dso__new(dso_name);
 			if (ndso == NULL)