kernel-5.10/perf-unwind-include-errno_h.patch

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perf/unwind: include errno.h unconditionally
EINVAL is used in other branches as well. Without errno.h, it ends up
undefined and the build fails. This happens with 32-bit ROSA kernels, for
example.
diff --git a/tools/perf/arch/x86/util/unwind-libunwind.c b/tools/perf/arch/x86/util/unwind-libunwind.c
index 4f16661cbdbb..597588c8c7e6 100644
--- a/tools/perf/arch/x86/util/unwind-libunwind.c
+++ b/tools/perf/arch/x86/util/unwind-libunwind.c
@@ -1,6 +1,7 @@
+#include <errno.h> /* for EINVAL */
+
#ifndef REMOTE_UNWIND_LIBUNWIND
-#include <errno.h>
#include <libunwind.h>
#include "perf_regs.h"
#include "../../util/unwind.h"