Fix a compilation error for the case where mallinfo() is not available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19201 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Process.inc b/lib/System/Unix/Process.inc
index 1953390..c1448de 100644
--- a/lib/System/Unix/Process.inc
+++ b/lib/System/Unix/Process.inc
@@ -57,7 +57,7 @@
 #elif defined(HAVE_SBRK)
   // Note this is only an approximation and more closely resembles
   // the value returned by mallinfo in the arena field.
-  char * eom = sbrk(0);
+  char * eom = (char*) sbrk(0);
   if (eom != ((char*)-1) && som != ((char*)-1))
     return eom - som;
   else