remove unecessary aws_raise_error() #740

Job	Run time
clang-sanitizers (,thread)	3m 2s
clang-sanitizers (,address,undefined)	2m 56s
linux-compat (manylinux2014-x64)	2m 37s
linux-compiler-compat (clang-3)	2m 33s
linux-shared-libs	2m 10s
linux-compiler-compat (clang-6)	3m 18s
linux-compat (manylinux2014-x86)	2m 17s
linux-compiler-compat (clang-8)	3m 43s
linux-compiler-compat (clang-9)	3m 28s
linux-compat (fedora-34-x64)	2m 1s
osx	2m 32s
linux-compiler-compat (clang-10)	2m 58s
linux-compat (opensuse-leap)	2m 54s
linux-compat (rhel8-x64)	2m 45s
linux-compiler-compat (clang-11)	3m 18s
linux-compat (al2-x64)	2m 3s
windows	4m 30s
windows-shared-libs	4m 4s
windows-vc14 (x86)	2m 35s
linux-compiler-compat (gcc-4.8)	2m 10s
windows-vc14 (x64)	3m 53s
linux-compiler-compat (gcc-5)	2m 36s
linux-compiler-compat (gcc-6)	2m 42s
linux-compiler-compat (gcc-7)	5m 17s
linux-compiler-compat (gcc-8)	2m 45s
downstream	2m 18s
	1h 17m 25s

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