[PATCH] Fix error message from -Wcast-qual when casting away volatile

[Magnus Reftel]

Currently, castring away volatile from a pointer makes -Wcast-qual
claim that __attribute__((noreturn)) was cast away (see bugzilla
55383). The attached patch, originally written by Manuel López-Ibáñez
and updated to match trunk by me, correctes that. No regressions on
gcc from applying this patch (as reported by "make check") were seen.

BR
Magnus Reftel

2014-03-11 Manuel López-Ibáñez  <manu@gcc.gnu.org>

 PR c/55383
 * c/c-typeck.c: use correct format string in cast-qual warning
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