Fix segfault when RPC client disconnects on linux app

[tehampson]

Introduced in #26133. This fixes a segfault on accessory when a RPC client disconnects

[github-actions]

PR #26320: Size comparison from 8478a1a to 24ed531

Full report (1 build for cc32xx)

platform	target	config	section	8478a1a	24ed531	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	603242	603242	0	0.0
			(read/write)	204156	204156	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197568	197568	0	0.0
			.comment	206	206	0	0.0
			.data	1468	1468	0	0.0
			.debug_abbrev	956811	956811	0	0.0
			.debug_aranges	103112	103112	0	0.0
			.debug_frame	348992	348992	0	0.0
			.debug_info	19544023	19544023	0	0.0
			.debug_line	2685716	2685716	0	0.0
			.debug_line_str	513	513	0	0.0
			.debug_loc	33340	33340	0	0.0
			.debug_loclists	1512739	1512739	0	0.0
			.debug_ranges	4984	4984	0	0.0
			.debug_rnglists	95853	95853	0	0.0
			.debug_str	3060275	3060275	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104250	104250	0	0.0
			.shstrtab	265	265	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	475944	475944	0	0.0
			.symtab	286032	286032	0	0.0
			.text	496868	496868	0	0.0