contrib: assume binary existence in sec/sym checks

If the binaries don't exist, the Guix build has failed for some other
reason.

There's no need to check for unknown architectures, or executable
formats, as the only ones that could be built are those that we've
configured toolchains for in Guix.

We've also been doing this inconsistently across the two scripts.

contrib/devtools/security-check.py

@@ -248,22 +248,11 @@ CHECKS = {
 if __name__ == '__main__':
     retval: int = 0
     for filename in sys.argv[1:]:
-        try:
         binary = lief.parse(filename)
         etype = binary.format
         arch = binary.abstract.header.architecture
         binary.concrete
 
-            if etype == lief.EXE_FORMATS.UNKNOWN:
-                print(f'{filename}: unknown executable format')
-                retval = 1
-                continue
-
-            if arch == lief.ARCHITECTURES.NONE:
-                print(f'{filename}: unknown architecture')
-                retval = 1
-                continue
-
         failed: list[str] = []
         for (name, func) in CHECKS[etype][arch]:
             if not func(binary):
@@ -271,8 +260,4 @@ if __name__ == '__main__':
         if failed:
             print(f'{filename}: failed {" ".join(failed)}')
             retval = 1
-        except IOError:
-            print(f'{filename}: cannot open')
-            retval = 1
     sys.exit(retval)
-

contrib/devtools/symbol-check.py

@@ -299,13 +299,8 @@ lief.EXE_FORMATS.PE: [
 if __name__ == '__main__':
     retval: int = 0
     for filename in sys.argv[1:]:
-        try:
         binary = lief.parse(filename)
         etype = binary.format
-            if etype == lief.EXE_FORMATS.UNKNOWN:
-                print(f'{filename}: unknown executable format')
-                retval = 1
-                continue
 
         failed: list[str] = []
         for (name, func) in CHECKS[etype]:
@@ -314,7 +309,4 @@ if __name__ == '__main__':
         if failed:
             print(f'{filename}: failed {" ".join(failed)}')
             retval = 1
-        except IOError:
-            print(f'{filename}: cannot open')
-            retval = 1
     sys.exit(retval)