Added missing @nonnull attribute to Function7. (#5102)

Author: alexandre-dubois

src/main/java/io/reactivex/functions/Function7.java

@@ -13,6 +13,8 @@
 
 package io.reactivex.functions;
 
+import io.reactivex.annotations.NonNull;
+
 /**
  * A functional interface (callback) that computes a value based on multiple input values.
  * @param <T1> the first value type
@@ -37,5 +39,6 @@ public interface Function7<T1, T2, T3, T4, T5, T6, T7, R> {
      * @return the result value
      * @throws Exception on error
      */
-    R apply(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7) throws Exception;
+    @NonNull
+    R apply(@NonNull T1 t1, @NonNull T2 t2, @NonNull T3 t3, @NonNull T4 t4, @NonNull T5 t5, @NonNull T6 t6, @NonNull T7 t7) throws Exception;
 }