udf: remove reporting loc in debug output

clang build fails with
fs/udf/partition.c:86:28: error: variable 'loc' is uninitialized when used here [-Werror,-Wuninitialized]
sb, block, partition, loc, index);
^~~

loc is now only known when bh is valid. So remove reporting loc in debug
output.

Fixes: 4215db46d538 ("udf: Use udf_bread() in udf_get_pblock_virt15()")
Reported-by: kernel test robot <[e-mail]>
Reported-by: "kernelci.org bot" <[e-mail]>
Signed-off-by: Tom Rix <[e-mail]>
Reviewed-by: Nathan Chancellor <[e-mail]>
Reviewed-by: Nick Desaulniers <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/udf/partition.c

···
 
 	bh = udf_bread(sbi->s_vat_inode, newblock, 0, &err);
 	if (!bh) {
-		udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u) VAT: %u[%u]\n",
-			  sb, block, partition, loc, index);
+		udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u)\n",
+			  sb, block, partition);
 		return 0xFFFFFFFF;
 	}