mem-cache: Init lastTriggerCounter for STeMS Prefetcher

Change-Id: I43a0093e6d35a39799d724e7dee15c95dbc26343
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54643
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/mem/cache/prefetch/spatio_temporal_memory_streaming.cc b/src/mem/cache/prefetch/spatio_temporal_memory_streaming.cc
index d0f4119..6030096 100644
--- a/src/mem/cache/prefetch/spatio_temporal_memory_streaming.cc
+++ b/src/mem/cache/prefetch/spatio_temporal_memory_streaming.cc
@@ -55,7 +55,8 @@
                          p.pattern_sequence_table_replacement_policy,
                          ActiveGenerationTableEntry(
                              spatialRegionSize / blkSize)),
-    rmob(p.region_miss_order_buffer_entries)
+    rmob(p.region_miss_order_buffer_entries),
+    lastTriggerCounter(0)
 {
     fatal_if(!isPowerOf2(spatialRegionSize),
         "The spatial region size must be a power of 2.");