x86: mlpdsp: avoid taking address of void

This code contains a C array of addresses of labels defined in
inline asm.  To do this, the names must be declared as external
in C.  The declared type does not matter since only the address is
used, and for some reason, the author of the code used the 'void'
type despite taking the address of a void expression being invalid.

Changing the type to char, a reasonable choice since the alignment
of the code labels cannot be known or guaranteed, eliminates gcc
warnings and allows building with suncc.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/x86/mlpdsp.c

@@ -25,21 +25,21 @@
 
 #if HAVE_7REGS
 
-extern void ff_mlp_firorder_8;
-extern void ff_mlp_firorder_7;
-extern void ff_mlp_firorder_6;
-extern void ff_mlp_firorder_5;
-extern void ff_mlp_firorder_4;
-extern void ff_mlp_firorder_3;
-extern void ff_mlp_firorder_2;
-extern void ff_mlp_firorder_1;
-extern void ff_mlp_firorder_0;
-
-extern void ff_mlp_iirorder_4;
-extern void ff_mlp_iirorder_3;
-extern void ff_mlp_iirorder_2;
-extern void ff_mlp_iirorder_1;
-extern void ff_mlp_iirorder_0;
+extern char ff_mlp_firorder_8;
+extern char ff_mlp_firorder_7;
+extern char ff_mlp_firorder_6;
+extern char ff_mlp_firorder_5;
+extern char ff_mlp_firorder_4;
+extern char ff_mlp_firorder_3;
+extern char ff_mlp_firorder_2;
+extern char ff_mlp_firorder_1;
+extern char ff_mlp_firorder_0;
+
+extern char ff_mlp_iirorder_4;
+extern char ff_mlp_iirorder_3;
+extern char ff_mlp_iirorder_2;
+extern char ff_mlp_iirorder_1;
+extern char ff_mlp_iirorder_0;
 
 static const void *firtable[9] = { &ff_mlp_firorder_0, &ff_mlp_firorder_1,
                                    &ff_mlp_firorder_2, &ff_mlp_firorder_3,