Fix a leak in wasm_loader_emit_br_info (#3900) #8499

Job	Run time
build (-DWAMR_BUILD_AOT=1 -DWAMR_BUILD_INTERP=0)	1m 39s
build (-DWAMR_BUILD_AOT=0)	59s
build (-DWAMR_BUILD_TAIL_CALL=1)	1m 39s
build (-DWAMR_BUILD_CUSTOM_NAME_SECTION=1)	1m 42s
build (-DWAMR_DISABLE_HW_BOUND_CHECK=1)	59s
build (-DWAMR_BUILD_REF_TYPES=1)	1m 47s
build (-DWAMR_BUILD_SIMD=1)	2m 2s
build (-DWAMR_BUILD_DEBUG_INTERP=1)	1m 24s
build (-DWAMR_BUILD_LIB_PTHREAD=1)	1m 31s
build (-DWAMR_BUILD_LIB_WASI_THREADS=1)	1m 15s
build (-DWAMR_BUILD_LIBC_UVWASI=0 -DWAMR_BUILD_LIBC_WASI=1)	1m 33s
test (classic-interp, $DEFAULT_TEST_OPTIONS)	4m 4s
test (classic-interp, $MULTI_MODULES_TEST_OPTIONS)	4m 3s
test (classic-interp, $THREADS_TEST_OPTIONS)	3m 23s
test (classic-interp, $WASI_TEST_OPTIONS)	1m 28s
test (fast-interp, $DEFAULT_TEST_OPTIONS)	3m 41s
test (fast-interp, $MULTI_MODULES_TEST_OPTIONS)	3m 45s
test (fast-interp, $THREADS_TEST_OPTIONS)	2m 56s
test (fast-interp, $WASI_TEST_OPTIONS)	1m 26s
	41m 16s

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