convert: fix declarations after case label #67
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This fixes a build failure with GCC/Clang where declarations directly after a case label are not valid in C.
Repro (Debian 11, GCC):
make convertfails with:error: a label can only be part of a statement and a declaration is not a statement
Also reproducible with clang on macOS.
Fix: wrap the 'p' case body in braces so the declarations are within a block scope.
Tested:
make convert.