elf: add go-fuzz target

As with the BTF fuzz target, add a function that tests ELF loading.

Author: lmb

elf_reader_fuzz.go

@@ -0,0 +1,21 @@
+// +build gofuzz
+
+// Use with https://github.com/dvyukov/go-fuzz
+
+package ebpf
+
+import "bytes"
+
+func FuzzLoadCollectionSpec(data []byte) int {
+	spec, err := LoadCollectionSpecFromReader(bytes.NewReader(data))
+	if err != nil {
+		if spec != nil {
+			panic("spec is not nil")
+		}
+		return 0
+	}
+	if spec == nil {
+		panic("spec is nil")
+	}
+	return 1
+}