qemu: Escape commas for qemuBuildRomStr

Add comma escaping for info->romfile.
Signed-off-by: NSukrit Bhatnagar <skrtbhtngr@gmail.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -459,8 +459,10 @@ qemuBuildRomStr(virBufferPtr buf,
         default:
             break;
         }
-        if (info->romfile)
-           virBufferAsprintf(buf, ",romfile=%s", info->romfile);
+        if (info->romfile) {
+           virBufferAddLit(buf, ",romfile=");
+           virQEMUBuildBufferEscapeComma(buf, info->romfile);
+        }
     }
     return 0;
 }