unchecked argv[idx] access

examples/simple_compression.c

@@ -116,7 +116,6 @@ static char* createOutFilename_orDie(const char* filename)
 int main(int argc, const char** argv)
 {
     const char* const exeName = argv[0];
-    const char* const inFilename = argv[1];
 
     if (argc!=2) {
         printf("wrong arguments\n");
@@ -125,6 +124,8 @@ int main(int argc, const char** argv)
         return 1;
     }
 
+    const char* const inFilename = argv[1];
+
     char* const outFilename = createOutFilename_orDie(inFilename);
     compress_orDie(inFilename, outFilename);
     free(outFilename);