crypto: fix missing nullptr check on RSA_new() #3591

Job	Run time
Build slim tarball	2m 31s
x86_64-linux: with shared libraries	24m 16s
aarch64-linux: with shared libraries	20m 42s
aarch64-darwin: with shared libraries	23m 15s
x86_64-darwin: with shared libraries	29m 46s
	1h 40m 30s

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