Fix confusing error message.

[bzbarsky-apple]

We were logging a message about "stop pairing" when the real error was that we could not get the device being commissioned.

[github-actions]

PR #26157: Size comparison from 8deb4ff to 6f8d493

Increases (1 build for cc32xx)

platform	target	config	section	8deb4ff	6f8d493	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20330829	20330830	1	0.0

Full report (2 builds for cc32xx, mbed)

platform	target	config	section	8deb4ff	6f8d493	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20330829	20330830	1	0.0
			.debug_line	2687904	2687904	0	0.0
			.debug_loc	2838960	2838960	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042335	3042335	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2466336	2466336	0	0.0
			.bss	215960	215960	0	0.0
			.data	5888	5888	0	0.0
			.text	1428980	1428980	0	0.0