[RFA] Assuming malloc exists in callfwmall.exp

[Michael Elizabeth Chastain]

I was going to drop this, but ...

> This is irrelevant.  The GDB test suite exists to verify that GDB
> behaves as documented.  If a test checks for behavior which is not
> guaranteed, the test is in error, and should simply be removed.

callfwmalls.exp checks that "call foo(10)" works in a target program
that does not call malloc.  That check is useful.

It also checks that "call foo("bar")" works in a target program that
does not call malloc.  That check is useless.

Michael