I see several bugs.
1. inspector show warning twice if function declaration and definition in the same file.
2. inspector does not find warnings in the compound statements.
3. inspector does not found warnings in the expression statements if call is second in list.
Code example:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void foo(int argc, char**argv);
int main(int argc, char**argv) {
    foo(argc, argv);
    return 0;
}
void foo(int argc, char**argv) {
    printf("Arguments (%ld):\n", argc);
    for (int i = 0; i < argc; i++,printf("%ld: %s\n", i, argv[i]));
    for (int i = 0; i < argc; i++) {
        printf("%ld: %s\n", i, argv[i]);
    }
    printf("%ld: %s\n", 0, argv[0]);
}