ACPICA: Add support for supressing leading zeros in hex strings

ACPICA commit 86289439d9f8b9eda28c249da66ae230d6439491

Currently the leading_zeros argument has no effect when
converting hex integers. Fix that.

Link: https://github.com/acpica/acpica/commit/86289439Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/exconvrt.c

@@ -270,6 +270,7 @@ acpi_ex_convert_to_ascii(u64 integer,
 	u32 decimal_length;
 	u32 remainder;
 	u8 supress_zeros = !leading_zeros;
+	u8 hex_char;
 
 	ACPI_FUNCTION_ENTRY();
 
@@ -330,8 +331,17 @@ acpi_ex_convert_to_ascii(u64 integer,
 
 			/* Get one hex digit, most significant digits first */
 
-			string[k] = (u8)
+			hex_char = (u8)
 			    acpi_ut_hex_to_ascii_char(integer, ACPI_MUL_4(j));
+
+			/* Supress leading zeros until the first non-zero character */
+
+			if (hex_char == ACPI_ASCII_ZERO && supress_zeros) {
+				continue;
+			}
+
+			supress_zeros = FALSE;
+			string[k] = hex_char;
 			k++;
 		}
 		break;