revert error to avoid translation changes

Author: rhooper

locale/circuitpython.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-08-04 18:42-0500\n"
+"POT-Creation-Date: 2020-08-08 18:40-0400\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <[email protected]>\n"
@@ -1942,6 +1942,7 @@ msgid "can't assign to expression"
 msgstr ""
 
 #: py/obj.c py/objint.c shared-bindings/i2cperipheral/I2CPeripheral.c
+#: shared-module/_pixelbuf/PixelBuf.c
 msgid "can't convert %q to %q"
 msgstr ""
 
@@ -3139,10 +3140,6 @@ msgstr ""
 msgid "tuple/list has wrong length"
 msgstr ""
 
-#: shared-bindings/_pixelbuf/PixelBuf.c
-msgid "tuple/list required on RHS"
-msgstr ""
-
 #: ports/atmel-samd/common-hal/busio/UART.c ports/nrf/common-hal/busio/UART.c
 #: shared-bindings/busio/UART.c
 msgid "tx and rx cannot both be None"

shared-bindings/_pixelbuf/PixelBuf.c

@@ -333,9 +333,7 @@ STATIC mp_obj_t pixelbuf_pixelbuf_subscr(mp_obj_t self_in, mp_obj_t index_in, mp
             size_t num_items = mp_obj_get_int(mp_obj_len(value));
 
             if (num_items != slice_len && num_items != (slice_len * common_hal__pixelbuf_pixelbuf_get_bpp(self_in))) {
-                mp_raise_ValueError_varg(translate("Unmatched number of items on RHS (expected %d or %d, got %d)."),
-                                                   slice_len, slice_len * common_hal__pixelbuf_pixelbuf_get_bpp(self_in),
-                                                   num_items);
+                mp_raise_ValueError_varg(translate("Unmatched number of items on RHS (expected %d, got %d)."), slice_len, num_items);
             }
 
             common_hal__pixelbuf_pixelbuf_set_pixels(self_in, slice.start, slice.step, slice_len, value, num_items != slice_len);