fix dumb typos from utf8 error return refactor

framebuffer/font_internal.c

@@ -59,7 +59,7 @@ fb_get_font(const plot_font_style_t *fstyle)
 	}
 }
 
-nserror_ret utf8_to_font_encoding(const struct fb_font_desc* font,
+nserror utf8_to_font_encoding(const struct fb_font_desc* font,
 				       const char *string,
 				       size_t len,
 				       char **result)

riscos/ucstables.c

@@ -645,7 +645,7 @@ nserror utf8_from_local_encoding(const char *string, size_t len, char **result)
 						(3 * SPECIAL_CHUNK_SIZE));
 				if (!temp) {
 					free(*result);
-					return NSERRO_NOMEM;
+					return NSERROR_NOMEM;
 				}
 
 				*result = temp;