some more explicitness

base16_from.c

@@ -77,6 +77,6 @@ int base16_valid(const char *src,size_t *count)
 		;
 
 	if (count)
-		*count = p - src;
+		*count = (size_t) (p - src);
 	return !*p;
 }

base32_from.c

@@ -96,6 +96,6 @@ int base32_valid(const char *src,size_t *count)
 		;
 
 	if (count)
-		*count = p - src;
+		*count = (size_t) (p - src);
 	return !*p;
 }

ioutil.c

@@ -20,7 +20,7 @@ int writeall(FH fd,const u8 *data,size_t len)
 				continue;
 			return -1;
 		}
-		len -= wrote;
+		len -= (size_t) wrote;
 		data += wrote;
 	}
 	return 0;