descriptor: Fix alignment for 32-bit words in parse_descriptor

parse_descriptor was aligning 32-bit words to 2 bytes, instead of 4
bytes. This didn't cause any issues before, because the only time the
32-bit word code path is used is from a 3 byte offset (which
incidentally aligns to 4 bytes). However, a 1 byte offset would
incorrectly align to 2 bytes.

Closes #734

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>

libusb/descriptor.c

diff --git a/libusb/descriptor.c b/libusb/descriptor.c
index 2097b84..be0aa83 100644
--- a/libusb/descriptor.c
+++ b/libusb/descriptor.c
@@ -53,14 +53,14 @@
 			*dp++ = *sp++;
 			break;
 		case 'w':	/* 16-bit word, convert from little endian to CPU */
-			dp += ((uintptr_t)dp & 1);	/* Align to word boundary */
+			dp += ((uintptr_t)dp & 1);			/* Align to word boundary */
 
 			*((uint16_t *)dp) = READ_LE16(sp);
 			sp += 2;
 			dp += 2;
 			break;
 		case 'd':	/* 32-bit word, convert from little endian to CPU */
-			dp += ((uintptr_t)dp & 1);	/* Align to word boundary */
+			dp = (uint8_t *)(((uintptr_t)dp + 3) & ~3);	/* Align to word boundary */
 
 			*((uint32_t *)dp) = READ_LE32(sp);
 			sp += 4;

libusb/version_nano.h

diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 9f10b11..820c720 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11523
+#define LIBUSB_NANO 11524