treewide: initialize empty structs with var

Change-Id: I72d3993eaf5fe57c77b1dda8218e36a8cc11813d
Reviewed-on: https://review.monogon.dev/c/monogon/+/3108
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/third_party/go/patches/gvisor-fix-debug-builds.patch b/third_party/go/patches/gvisor-fix-debug-builds.patch
index ea5b04d..ceafb5c 100644
--- a/third_party/go/patches/gvisor-fix-debug-builds.patch
+++ b/third_party/go/patches/gvisor-fix-debug-builds.patch
@@ -407,7 +407,7 @@
 +			// interrupted KVM. Since we're in a signal handler
 +			// currently, all signals are masked and the signal
 +			// must have been delivered directly to this thread.
-+			timeout := unix.Timespec{}
++			var timeout unix.Timespec
 +			sig, _, errno := unix.RawSyscall6( // escapes: no.
 +				unix.SYS_RT_SIGTIMEDWAIT,
 +				uintptr(unsafe.Pointer(&bounceSignalMask)),