staging: fbtft: Consider type of init sequence values in fbtft_init_display()

In the fbtft_init_display() the init sequence is printed for
the debug purposes. Unfortunately the current code doesn't take
into account that values in the buffer are of the s16 type.

Consider that and replace the printing code with fbtft_par_dbg_hex()
call.

Fixes: b8888970 ("staging/fbtft: Remove all strcpy() uses")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220316165351.58107-2-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/fbtft-core.c

@@ -1034,10 +1034,9 @@ int fbtft_init_display(struct fbtft_par *par)
 			for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++)
 				;
 
-			fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
-				      "init: write(0x%02X) %*ph\n",
-				      par->init_sequence[i], j,
-				      &par->init_sequence[i + 1]);
+			fbtft_par_dbg_hex(DEBUG_INIT_DISPLAY, par, par->info->device,
+					  s16, &par->init_sequence[i + 1], j,
+					  "init: write(0x%02X)", par->init_sequence[i]);
 
 			/* Write */
 			j = 0;