refactor(fs/mem): Get rid of another unnecessary allocation

[fogti]

Continuation of #2090.

[mkroening]

Thanks! :)

[github-actions]

Benchmark Results

Benchmark	Current: dea6f31	Previous: 32f7428	Performance Ratio
startup_benchmark Build Time	116.43 s	116.16 s	1.00
startup_benchmark File Size	0.90 MB	0.90 MB	1.00
Startup Time - 1 core	1.00 s (±0.03 s)	0.98 s (±0.03 s)	1.01
Startup Time - 2 cores	1.01 s (±0.02 s)	1.01 s (±0.02 s)	1.00
Startup Time - 4 cores	1.01 s (±0.02 s)	1.01 s (±0.03 s)	1.00
multithreaded_benchmark Build Time	116.73 s	115.94 s	1.01
multithreaded_benchmark File Size	1.00 MB	1.00 MB	1.00
Multithreaded Pi Efficiency - 2 Threads	88.77 % (±6.07 %)	92.30 % (±8.26 %)	0.96
Multithreaded Pi Efficiency - 4 Threads	44.12 % (±3.05 %)	44.69 % (±3.43 %)	0.99
Multithreaded Pi Efficiency - 8 Threads	25.23 % (±1.79 %)	25.48 % (±1.96 %)	0.99
micro_benchmarks Build Time	324.66 s	310.65 s	1.05
micro_benchmarks File Size	1.01 MB	1.01 MB	1.00
Scheduling time - 1 thread	191.32 ticks (±35.39 ticks)	184.07 ticks (±27.78 ticks)	1.04
Scheduling time - 2 threads	108.54 ticks (±18.96 ticks)	107.49 ticks (±17.05 ticks)	1.01
Micro - Time for syscall (getpid)	13.11 ticks (±4.40 ticks)	12.29 ticks (±5.96 ticks)	1.07
Memcpy speed - (built_in) block size 4096	53663.48 MByte/s (±38829.32 MByte/s)	61044.21 MByte/s (±43551.15 MByte/s)	0.88
Memcpy speed - (built_in) block size 1048576	14156.33 MByte/s (±12232.29 MByte/s)	13571.72 MByte/s (±11585.99 MByte/s)	1.04
Memcpy speed - (built_in) block size 16777216	6631.98 MByte/s (±5310.73 MByte/s)	9389.72 MByte/s (±7546.26 MByte/s)	0.71
Memset speed - (built_in) block size 4096	54092.54 MByte/s (±39135.04 MByte/s)	61142.74 MByte/s (±43628.69 MByte/s)	0.88
Memset speed - (built_in) block size 1048576	14404.61 MByte/s (±12335.96 MByte/s)	13977.23 MByte/s (±11848.46 MByte/s)	1.03
Memset speed - (built_in) block size 16777216	6668.20 MByte/s (±5324.62 MByte/s)	9550.52 MByte/s (±7627.95 MByte/s)	0.70
Memcpy speed - (rust) block size 4096	48120.93 MByte/s (±36779.44 MByte/s)	52582.38 MByte/s (±38288.51 MByte/s)	0.92
Memcpy speed - (rust) block size 1048576	12510.71 MByte/s (±10290.13 MByte/s)	14038.11 MByte/s (±11659.56 MByte/s)	0.89
Memcpy speed - (rust) block size 16777216	6745.13 MByte/s (±5418.74 MByte/s)	9160.23 MByte/s (±7348.29 MByte/s)	0.74
Memset speed - (rust) block size 4096	48380.58 MByte/s (±36967.73 MByte/s)	53707.92 MByte/s (±39201.38 MByte/s)	0.90
Memset speed - (rust) block size 1048576	12866.89 MByte/s (±10508.31 MByte/s)	14323.01 MByte/s (±11801.22 MByte/s)	0.90
Memset speed - (rust) block size 16777216	6780.29 MByte/s (±5431.57 MByte/s)	9446.19 MByte/s (±7561.24 MByte/s)	0.72
alloc_benchmarks Build Time	309.03 s	310.83 s	0.99
alloc_benchmarks File Size	0.97 MB	0.97 MB	1.00
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	21055.95 Ticks (±1335.41 Ticks)	20952.80 Ticks (±1132.25 Ticks)	1.00
Allocations - Average Allocation time (no fail)	21055.95 Ticks (±1335.41 Ticks)	20952.80 Ticks (±1132.25 Ticks)	1.00
Allocations - Average Deallocation time	2755.84 Ticks (±721.01 Ticks)	2654.62 Ticks (±435.62 Ticks)	1.04
mutex_benchmark Build Time	304.80 s	305.05 s	1.00
mutex_benchmark File Size	1.01 MB	1.01 MB	1.00
Mutex Stress Test Average Time per Iteration - 1 Threads	39.46 ns (±4.21 ns)	39.68 ns (±5.03 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	31.62 ns (±2.70 ns)	32.30 ns (±3.40 ns)	0.98

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