sh4: Fix compiler warning (fprintf format string)

When argument checking is enabled, gcc throws this error:

error: format not a string literal and no format arguments

The patch rewrites the statement to satisfy the compiler.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/sh4-dis.c b/sh4-dis.c
index 41fd866..078a6b2 100644
--- a/sh4-dis.c
+++ b/sh4-dis.c
@@ -1493,10 +1493,10 @@
 		  print_dsp_reg (field_b & 0xf, fprintf_fn, stream);
 		  break;
 		case DSP_REG_X:
-		  fprintf_fn (stream, sx_tab[(field_b >> 6) & 3]);
+		  fprintf_fn (stream, "%s", sx_tab[(field_b >> 6) & 3]);
 		  break;
 		case DSP_REG_Y:
-		  fprintf_fn (stream, sy_tab[(field_b >> 4) & 3]);
+		  fprintf_fn (stream, "%s", sy_tab[(field_b >> 4) & 3]);
 		  break;
 		case A_MACH:
 		  fprintf_fn (stream, "mach");