libgfortran/m4/unpack.m4: Silence -Wmaybe-uninitialized

libgfortran/m4/unpack.m4: Silence -Wmaybe-uninitialized

libgfortran/ChangeLog:

	* m4/unpack.m4 (unpack0_'rtype_code`,
	unpack1_'rtype_code`): Move 'rstride[0]' initialization outside
	conditional branch to silence -Wmaybe-uninitialized.
	* generated/unpack_c10.c: Regenerate.
	* generated/unpack_c16.c: Regenerate.
	* generated/unpack_c4.c: Regenerate.
	* generated/unpack_c8.c: Regenerate.
	* generated/unpack_i1.c: Regenerate.
	* generated/unpack_i16.c: Regenerate.
	* generated/unpack_i2.c: Regenerate.
	* generated/unpack_i4.c: Regenerate.
	* generated/unpack_i8.c: Regenerate.
	* generated/unpack_r10.c: Regenerate.
	* generated/unpack_r16.c: Regenerate.
	* generated/unpack_r4.c: Regenerate.
	* generated/unpack_r8.c: Regenerate.