n-i-bz: Replace non-POSIX bzero with proper memset. At least for internal-only, Darwin functionality. Picked up by cppcheck. No regressions within test suite.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14990 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/launcher-darwin.c b/coregrind/launcher-darwin.c
index 4d96b72..2b14697 100644
--- a/coregrind/launcher-darwin.c
+++ b/coregrind/launcher-darwin.c
@@ -291,7 +291,7 @@
       asprintf(&vgpreload_core, "%s/vgpreload_core-%s-darwin.so", valgrind_lib, valid_archs[i].valgrind_name);
       if (access(vgpreload_core, R_OK|X_OK) != 0) {
          VG_(debugLog)(1, "launcher", "arch '%s' IS NOT installed\n", valid_archs[i].valgrind_name);
-         bzero(&valid_archs[i], sizeof(valid_archs[i]));
+         memset(&valid_archs[i], 0, sizeof(valid_archs[i]));
       } else {
          VG_(debugLog)(1, "launcher", "arch '%s' IS installed\n", valid_archs[i].valgrind_name);
       }