tools api fs: Avoid large static PATH_MAX arrays

Change struct fs to have a pointer to a dynamically allocated array
rather than an array. This reduces the size of fs__entries from 24,768
bytes to 240 bytes. Read paths into a stack allocated array and
strdup. Fix off-by-1 fscanf %<num>s in fs__read_mounts caught by
address sanitizer.

Signed-off-by: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: K Prateek Nayak <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Steven Rostedt (Google) <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Masami Hiramatsu (Google) <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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