Avoid memory leak in ASan test

[krytarowski]

Summary

Add missing free(3) for the malloc(3) call.

Detected on NetBSD with LSan.

[krytarowski]

=================================================================
==371==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 10 byte(s) in 1 object(s) allocated from:
    #0 0x80f57b2 in malloc /public/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x812088a in main /public/compiler-rt/test/asan/TestCases/inline.cpp:14:28
    #2 0x806480b in ___start (/public/llvm-build/projects/compiler-rt/test/asan/I386NetBSDConfig/TestCases/Output/inline.cpp.tmp+0x806480b)

SUMMARY: AddressSanitizer: 10 byte(s) leaked in 1 allocation(s)

compiler-rt/trunk/test/asan/TestCases/inline.cpp

 // RUN: %clangxx_asan -O3 %s -o %t && %run %t
 
 // Test that no_sanitize_address attribute applies even when the function would
 // be normally inlined.
 
 #include <stdlib.h>
 
 __attribute__((no_sanitize_address))
 int f(int *p) {
   return *p; // BOOOM?? Nope!
 }
 
 int main(int argc, char **argv) {
   int * volatile x = (int*)malloc(2*sizeof(int) + 2);
   int res = f(x + 2);
+  free(x);
   if (res)
     exit(0);
   return 0;
 }