Fixup some warnings

archival/bunzip2.c

@@ -33,6 +33,8 @@
 int bunzip2_main(int argc, char **argv)
 {
 	char *compressed_name;
+	/* Note: Ignore the warning about save_name being used uninitialized.
+	 * That is not the case, but gcc has trouble working that out... */
 	char *save_name;
 	unsigned long opt;
 	int status;

archival/libunarchive/decompress_bunzip2.c

@@ -134,6 +134,8 @@ static unsigned int get_bits(bunzip_data *bd, char bits_wanted)
 
 static int get_next_block(bunzip_data *bd)
 {
+	/* Note: Ignore the warning about hufGroup, base and limit being used uninitialized.
+	 * They will be initialized on the fist pass of the loop. */
 	struct group_data *hufGroup;
 	int dbufCount,nextSym,dbufSize,groupCount,*base,*limit,selector,
 		i,j,k,t,runPos,symCount,symTotal,nSelectors,byteCount[256];