According to style(9), the OpenBSD kernel source uses KNF (Kernel Normal Form) coding style, which is also referred to in the source for the indent(1) program in the OpenBSD base install. (See /usr/src/usr.bin/indent/README.)
So it's possible, likely even, that the default state for indent(1) is to reformat to KNF style without needing an ~/.indent.pro file at all.
I tested it on a couple of C source files I had lying around and the results look correct, but I'm not familiar enough with the KNF style to say for definite. Might be worth a shot though.
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dc -e '[q]sa[ln0=aln256%Pln256/snlbx]sb12247225403800449909543746snlbxq'
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