sim: Fix mismatch between #ifndef and #define in varargs.hh

Change-Id: I558b6c3c69a5003a77cc95b414e620715c3dbbae
Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28169
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/sim/guest_abi/varargs.hh b/src/sim/guest_abi/varargs.hh
index 41e3c62..6a19db8 100644
--- a/src/sim/guest_abi/varargs.hh
+++ b/src/sim/guest_abi/varargs.hh
@@ -26,7 +26,7 @@
  */
 
 #ifndef __SIM_GUEST_ABI_VARARGS_HH__
-#define __SIM_GUEST_ABI_VARRAGS_HH__
+#define __SIM_GUEST_ABI_VARARGS_HH__
 
 #include <memory>
 #include <sstream>