Fix code scanning alert no. 2621: Multiplication result converted to larger type

[cooljeanius]

Fixes https://github.com/cooljeanius/apple-gdb-1824/security/code-scanning/2621

To fix the problem, we need to ensure that the multiplication is performed using a larger integer type to prevent overflow. This can be achieved by casting one of the operands to unsigned long before performing the multiplication. This way, the multiplication will be done in the unsigned long type, which has a larger range and can accommodate larger results without overflowing.

• General Fix: Cast one of the operands to unsigned long before the multiplication.
• Detailed Fix: In the file src/gdb/symfile.c, locate the line i * TARGET_LONG_BYTES and change it to (unsigned long)i * TARGET_LONG_BYTES.
• Specific Changes: Modify line 5546 to cast i to unsigned long before the multiplication.

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[cooljeanius]

ok