[FIX] Make Parsee build on GCC without warns

src/Streams/Reader.c

@@ -10,10 +10,10 @@
 Stream *
 StrStreamReaderN(char *buffer, int n)
 {
-    if (!buffer)
+    if (!buffer || n < 0)
     {
         return NULL;
     }
 
-    return StreamFile(fmemopen(buffer, n ? n : strlen(buffer), "rb"));
+    return StreamFile(fmemopen(buffer, n ? (size_t) n : strlen(buffer), "rb"));
 }

src/Streams/Writer.c

@@ -11,6 +11,9 @@ static ssize_t
 ReadStreamWriter(void *coop, void *to, size_t n)
 {
     /* Reading from a stream writer is silly. */
+    (void) coop;
+    (void) to;
+    (void) n;
     return 0;
 }
 static ssize_t
@@ -33,6 +36,9 @@ static off_t
 SeekStreamWriter(void *coop, off_t mag, int sgn)
 {
     /* TODO: Seeking would be useful, though not supported yet. */
+    (void) coop;
+    (void) mag;
+    (void) sgn;
     return 0;
 }
 
@@ -40,10 +46,11 @@ static int
 CloseStreamWriter(void *coop)
 {
     /* Nothing to free as of now. */
+    (void) coop;
     return 0;
 }
 
-const static IoFunctions Functions = {
+static const IoFunctions Functions = {
     .read   = ReadStreamWriter,
     .seek   = SeekStreamWriter,
     .write  = WriteStreamWriter,