maddr: decode only display part of address

RFC 2047.6.2:
   NOTE: Decoding and display of encoded-words occurs *after* a
   structured field body is parsed into tokens.

maddr.c

@@ -57,12 +57,14 @@ addr(char *file)
 		v = blaze822_chdr(msg, h);
 		if (v) {
 			char *disp, *addr;
-			char vdec[16384];
-			blaze822_decode_rfc2047(vdec, v, sizeof vdec - 1, "UTF-8");
-			vdec[sizeof vdec - 1] = 0;
-			v = vdec;
-
+			char ddec[16384];
 			while ((v = blaze822_addr(v, &disp, &addr))) {
+				if (disp) {
+					blaze822_decode_rfc2047(ddec, disp, sizeof ddec - 1, "UTF-8");
+					ddec[sizeof ddec - 1] = 0;
+					disp = ddec;
+				}
+
 				if (disp && addr && strcmp(disp, addr) == 0)
 					disp = 0;