ASoC: SOF: Intel: fix iteration in is_endpoint_present() #8293

Job	Run time
GCC static -fanalyzer	4m 11s
GCC build X86_64 with W=1	2m 55s
GCC build i386	17m 21s
GCC build X86_64	20m 1s
Sparse check	4m 9s
GCC build arm64 allmodconfig	1m 49s
Clang build x86_64	4m 44s
GCC build arm64	24m 10s
GCC build X86_64 with W=1 allmodconfig	1m 54s
	1h 21m 14s

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