Add basic go-fuzz support

corpus/05979b224be0294bf350310d4ba5257c9bb815db-3

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corpus/521e7e67b6063a75e0eeb24b0d1dd20731d34ad8-4

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corpus/581b8fe7088f921567811fdf30e1f527c9f48e5e

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corpus/80881d1b911b95e0203b3b0e7dc6360c35f7620f-7

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corpus/ce3c6f4c31f74d72fbf74c17d14a8d29aa62059e-6

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fuzz.go

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+// +build gofuzz
+
+package snappy
+
+func Fuzz(data []byte) int {
+	decode, err := Decode(data)
+	if decode == nil && err == nil {
+		panic("nil error with nil result")
+	}
+
+	if err != nil {
+		return 0
+	}
+
+	return 1
+}