[asan] Remove semicolon after do {} while (0)

[vries]

Summary

this removes a semicolon after "do {} while (0)" in CHECK_SMALL_REGION. This allows the macro to be used in if-then-elses without curly braces.

[ https://gcc.gnu.org/ml/gcc-patches/2017-11/msg00298.html ]

[vries]

Committed.

[jroelofs]

LGTM

lib/asan/asan_poisoning.cc

do {                                                        \
     uptr __p = reinterpret_cast<uptr>(p);                     \
     uptr __size = size;                                       \
     if (UNLIKELY(__asan::AddressIsPoisoned(__p) ||            \
         __asan::AddressIsPoisoned(__p + __size - 1))) {       \
       GET_CURRENT_PC_BP_SP;                                   \
       uptr __bad = __asan_region_is_poisoned(__p, __size);    \
       __asan_report_error(pc, bp, sp, __bad, isWrite, __size, 0);\
     }                                                         \
-  } while (false);                                            \
+  } while (false)
 
 
 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 u16 __sanitizer_unaligned_load16(const uu16 *p) {
   CHECK_SMALL_REGION(p, sizeof(*p), false);
   return *p;
 }