KT-2317 Wrong UNNECESSARY_SAFE_CALL

#KT-2317 Fixed

compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/InfixCallNullability.jet

@@ -32,7 +32,7 @@ fun test(x : Int?, a : A?) {
     a.times(1)
     a * 1
     a times 1
-    a<!UNNECESSARY_SAFE_CALL!>?.<!>times(1)
+    a?.times(1)
 
     1 <!UNSAFE_INFIX_CALL!>in<!> a
     a <!UNSAFE_INFIX_CALL!>contains<!> 1

compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/ReceiverNullability.jet

@@ -12,7 +12,7 @@ fun test(a : A?) {
 
     a?.foo()
     a?.bar()
-    a<!UNNECESSARY_SAFE_CALL!>?.<!>buzz() // warning
+    a?.buzz()
 }
 
 fun A.test2() {
@@ -40,5 +40,5 @@ fun A?.test3() {
 
     this?.foo()
     this?.bar()
-    this<!UNNECESSARY_SAFE_CALL!>?.<!>buzz() // warning
+    this?.buzz()
 }