Replace "if (x) free (x)" with "free (x)", opcodes

cpu/
	* mep.opc (mep_cgen_expand_macros_and_parse_operand): Replace
	"if (x) free (x)" with "free (x)".
opcodes/
	* arc-ext.c: Replace "if (x) free (x)" with "free (x)" throughout.
	* sparc-dis.c: Likewise.
	* tic4x-dis.c: Likewise.
	* xtensa-dis.c: Likewise.
	* bpf-desc.c: Regenerate.
	* epiphany-desc.c: Regenerate.
	* fr30-desc.c: Regenerate.
	* frv-desc.c: Regenerate.
	* ip2k-desc.c: Regenerate.
	* iq2000-desc.c: Regenerate.
	* lm32-desc.c: Regenerate.
	* m32c-desc.c: Regenerate.
	* m32r-desc.c: Regenerate.
	* mep-asm.c: Regenerate.
	* mep-desc.c: Regenerate.
	* mt-desc.c: Regenerate.
	* or1k-desc.c: Regenerate.
	* xc16x-desc.c: Regenerate.
	* xstormy16-desc.c: Regenerate.