Apply suggestions from code review

Author: steakhal

clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp

@@ -3157,7 +3157,7 @@ void MallocChecker::checkPreCall(const CallEvent &Call,
     SVal ArgSVal = Call.getArgSVal(I);
     if (isa<Loc>(ArgSVal)) {
       SymbolRef Sym = ArgSVal.getAsSymbol(/*IncludeBaseRegions=*/true);
-      if (!Sym) 
+      if (!Sym)
         continue;
       if (checkUseAfterFree(Sym, C, Call.getArgExpr(I)))
         return;

clang/test/Analysis/malloc-checker-arg-uaf.c

@@ -1,4 +1,4 @@
-// RUN: %clang_analyze_cc1 -analyzer-checker=unix.Malloc -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,unix.Malloc -verify %s
 
 #include "Inputs/system-header-simulator-for-malloc.h"
 
@@ -37,8 +37,8 @@ void test_nested_alloc() {
 }
 
 void test_nested_field() {
-    struct Obj *o = malloc(sizeof(struct Obj));
+    struct Obj *o = (struct Obj *)malloc(sizeof(struct Obj));
     int *f = &o->field;
     free(o);
     use(f); // expected-warning{{Use of memory after it is freed}}
-}
+}