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9813fb56d2
Newer compilers e.g. clang19+ will treat implicit function prototypes
as errors, therefore define main() with a valid return type
Fixes
ckwart.c:531:1: error: return type defaults to ‘int’ [-Wimplicit-int]
531 | main(argc,argv) int argc; char **argv; {
| ^~~~
Signed-off-by: Khem Raj <raj.khem@gmail.com>