Patch request: Fix a macro expansion segfault from unchecked overflow.

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Hello,

I've attached to this email a patch that fixes a segfault from
=E2=80=98expand_user_macro=E2=80=99 so that integer overflows don't bypass =
the bounds
check.  It applies to =E2=80=98branch-1.4=E2=80=99.

Byron

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<div dir=3D"ltr"><div>Hello,</div><div><br></div><div>I&#39;ve attached to =
this email a patch that fixes a segfault from =E2=80=98expand_user_macro=E2=
=80=99 so that integer overflows don&#39;t bypass the bounds check.=C2=A0 I=
t applies to =E2=80=98branch-1.4=E2=80=99.</div><div><br></div><div>Byron<b=
r></div></div>

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