Rename errno to code

Author: ikspress

src/mfoc.c

@@ -753,7 +753,7 @@ int main(int argc, char *const argv[])
   exit(EXIT_FAILURE);
 }
 
-void usage(FILE *stream, int errno)
+void usage(FILE *stream, int code)
 {
   fprintf(stream, "Usage: mfoc [-h] [-k key] [-f file] ... [-P probnum] [-T tolerance] [-O output]\n");
   fprintf(stream, "\n");
@@ -776,7 +776,7 @@ void usage(FILE *stream, int errno)
   fprintf(stream, "\n");
   fprintf(stream, "This is mfoc version %s.\n", PACKAGE_VERSION);
   fprintf(stream, "For more information, run: 'man mfoc'.\n");
-  exit(errno);
+  exit(code);
 }
 
 void mf_init(mfreader *r)

src/mfoc.h

@@ -82,7 +82,7 @@ typedef struct {
 } countKeys;
 
 
-void usage(FILE *stream, int errno);
+void usage(FILE *stream, int code);
 void mf_init(mfreader *r);
 void mf_configure(nfc_device *pdi);
 void mf_select_tag(nfc_device *pdi, nfc_target *pnt);