staging: gpib: fmh: Drop residue from fmh_gpid_fifo_read_countable()

Clang warns (or errors with CONFIG_WERROR=y):

  drivers/staging/gpib/fmh_gpib/fmh_gpib.c:970:43: error: variable 'residue' is uninitialized when used here [-Werror,-Wuninitialized]
    970 |                                 (int)(*bytes_read), (int)length, (int)residue);
        |                                                                       ^~~~~~~

residue is never initialized in this function and it is not used outside
of an error print. Just remove it altogether, as it is likely not
necessary in this function, as this same exact statement in present in
fmh_gpib_dma_read().

Fixes: 8e4841a0888c ("staging: gpib: Add Frank Mori Hess FPGA PCI GPIB driver")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20241015-staging-gpib-fmh-fix-residue-used-uninitialized-v1-1-23ef05b099da@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/gpib/fmh_gpib/fmh_gpib.c b/drivers/staging/gpib/fmh_gpib/fmh_gpib.c
index 07c75ba8df7c53041e3cf013bb769677ac205381..0e27b3ef1a1df217b05de710412a683d5d381a25 100644 (file)
--- a/drivers/staging/gpib/fmh_gpib/fmh_gpib.c
+++ b/drivers/staging/gpib/fmh_gpib/fmh_gpib.c
@@ -922,7 +922,6 @@ static int fmh_gpib_fifo_read_countable(gpib_board_t *board, uint8_t *buffer,
        struct fmh_priv *e_priv = board->private_data;
        struct nec7210_priv *nec_priv = &e_priv->nec7210_priv;
        int retval = 0;
-       unsigned int residue;
 
        //      printk("%s: enter, bus_address=0x%x, length=%i\n", __FUNCTION__,
        // (unsigned)bus_address,
@@ -966,8 +965,8 @@ cleanup:
                unsigned int data_value;
 
                if ((*bytes_read) >= length) {
-                       dev_err(board->dev, "unexpected extra bytes in rx fifo, discarding!  bytes_read=%d length=%d residue=%d\n",
-                               (int)(*bytes_read), (int)length, (int)residue);
+                       dev_err(board->dev, "unexpected extra bytes in rx fifo, discarding!  bytes_read=%d length=%d\n",
+                               (int)(*bytes_read), (int)length);
                        break;
                }
                data_value = fifos_read(e_priv, FIFO_DATA_REG);
@@ -976,8 +975,8 @@ cleanup:
                        *end = 1;
        }
 
-//     printk("\tbytes_read=%i, residue=%i, end=%i, retval=%i, wait_retval=%i\n",
-//                *bytes_read, residue, *end, retval, wait_retval);
+//     printk("\tbytes_read=%i, end=%i, retval=%i, wait_retval=%i\n",
+//                *bytes_read, *end, retval, wait_retval);
 
        return retval;
 }