gas: fix rs_fill_nop listing

In commit a0094f1a70 ("gas: make .nops output visible in listing") I
was wrongly assuming fr_fix would be zero for rs_fill_nop, when that's
only a side effect of listing_newline() inserting dummy frags, but only
when file/line did actually change from the previous invocation. This is
in particular not going to be true when the .nops directive isn't the
first statement on a line.

gas/listing.c

@@ -820,9 +820,8 @@ calc_hex (list_info_type *list)
 	}
       else if (frag_ptr->fr_type == rs_fill_nop && frag_ptr->fr_opcode)
 	{
-	  gas_assert (!octet_in_frag);
-
 	  /* Print as many bytes from fr_opcode as is sensible.  */
+	  octet_in_frag = 0;
 	  while (octet_in_frag < (unsigned int) frag_ptr->fr_offset
 		 && data_buffer_size < MAX_BYTES - 3)
 	    {

gas/testsuite/gas/i386/i386.exp

@@ -638,6 +638,7 @@ if [gas_32_check] then {
     run_dump_test "nop-1-suffix"
     run_list_test "nop-1" "-aln"
     run_dump_test "nop-2"
+    run_list_test "nop-7" "-aln"
     run_dump_test "optimize-1"
     run_dump_test "optimize-1a"
     run_dump_test "optimize-2"

gas/testsuite/gas/i386/nop-7.l

@@ -0,0 +1,6 @@
+[ 	]*[0-9]+[ 	]+\.text
+[ 	]*[0-9]+[ 	]+nops:
+[ 	]*[0-9]+[ 	]+.... F88D7426[ 	]+clc; \.nops 4; stc
+[ 	]*[0-9]+[ 	]+00F9
+[ 	]*[0-9]+[ 	]+.... C3[ 	]+ret
+#pass

gas/testsuite/gas/i386/nop-7.s

@@ -0,0 +1,6 @@
+	.text
+nops:
+	clc; .nops 4; stc
+	ret
+
+	.end