Fix sysdeps/ieee754/dbl-64/mpa.c for -Wuninitialized.

If you remove the "override CFLAGS += -Wno-uninitialized" in
math/Makefile, one of the errors you get is:

../sysdeps/ieee754/dbl-64/mpa.c: In function '__mp_dbl.part.0':
../sysdeps/ieee754/dbl-64/mpa.c:183:5: error: 'c' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   c *= X[0];

The problem is that the p < 5 case initializes c if p is 1, 2, 3 or 4
but not otherwise, and in fact p is positive for all calls to this
function so the uninitialized case can't actually occur.  This patch
replaces the "if (p == 4)" last case with a comment so the compiler
can see that all paths do initialize c.

Tested for x86_64.

	* sysdeps/ieee754/dbl-64/mpa.c (norm): Remove if condition on
	(p == 4) case.