pkg/covermerger: test failure

[a-nogikh]

From a recent ci / race:

2024-05-17T09:19:22.7265141Z --- FAIL: TestAggregateStreamData (1.05s)
2024-05-17T09:19:22.7269374Z     --- FAIL: TestAggregateStreamData/aesni-intel_glue (1.04s)
2024-05-17T09:19:22.7271789Z         covermerger_test.go:136: 
2024-05-17T09:19:22.7274324Z             	Error Trace:	/__w/syzkaller/syzkaller/gopath/src/github.com/google/syzkaller/pkg/covermerger/covermerger_test.go:136
2024-05-17T09:19:22.7275664Z             	Error:      	Not equal: 
2024-05-17T09:19:22.7277167Z             	            	expected: map[string]*covermerger.MergeResult{"arch/x86/crypto/aesni-intel_glue.c":(*covermerger.MergeResult)(0xc00002e130)}
2024-05-17T09:19:22.7279327Z             	            	actual  : map[string]*covermerger.MergeResult{"arch/x86/crypto/aesni-intel_glue.c":(*covermerger.MergeResult)(0xc00002e100)}
2024-05-17T09:19:22.7280496Z             	            	
2024-05-17T09:19:22.7280960Z             	            	Diff:
2024-05-17T09:19:22.7281533Z             	            	--- Expected
2024-05-17T09:19:22.7282032Z             	            	+++ Actual
2024-05-17T09:19:22.7282615Z             	            	@@ -2,3 +2,3 @@
2024-05-17T09:19:22.7283818Z             	            	  (string) (len=34) "arch/x86/crypto/aesni-intel_glue.c": (*covermerger.MergeResult)({
2024-05-17T09:19:22.7284921Z             	            	-  HitCounts: (map[int]int) (len=55) {
2024-05-17T09:19:22.7285893Z             	            	+  HitCounts: (map[int]int) (len=51) {
2024-05-17T09:19:22.7286555Z             	            	    (int) 228: (int) 5,
2024-05-17T09:19:22.7287204Z             	            	@@ -53,7 +53,3 @@
2024-05-17T09:19:22.7287764Z             	            	    (int) 1148: (int) 58,
2024-05-17T09:19:22.7288477Z             	            	-   (int) 1149: (int) 58,
2024-05-17T09:19:22.7289172Z             	            	-   (int) 1400: (int) 28,
2024-05-17T09:19:22.7289849Z             	            	-   (int) 1404: (int) 28,
2024-05-17T09:19:22.7290576Z             	            	-   (int) 1424: (int) 4,
2024-05-17T09:19:22.7291260Z             	            	-   (int) 1435: (int) 4
2024-05-17T09:19:22.7291840Z             	            	+   (int) 1149: (int) 58
2024-05-17T09:19:22.7292423Z             	            	   },
2024-05-17T09:19:22.7293160Z             	Test:       	TestAggregateStreamData/aesni-intel_glue
2024-05-17T09:19:22.7293931Z FAIL
2024-05-17T09:19:22.7294270Z exit status 1
2024-05-17T09:19:22.7294917Z FAIL	github.com/google/syzkaller/pkg/covermerger	1.136s