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opl_linux: fix number of port requested by ioperm()

--- a/opl/opl_linux.c

+++ b/opl/opl_linux.c

@@ -35,7 +35,7 @@

 {

     // Try to get permissions:

-    if (ioperm(port_base, 2, 1) < 0)

+    if (ioperm(port_base, 3, 1) < 0)

     {

         fprintf(stderr, "Failed to get I/O port permissions for 0x%x: %s\n",

                         port_base, strerror(errno));