perf riscv: Fix the warning due to the incompatible type

In the 32-bit platform, the second argument of getline is expectd to be
'size_t *'(aka 'unsigned int *'), but line_sz is of type
'unsigned long *'. Therefore, declare line_sz as size_t.

Signed-off-by: Ben Zong-You Xie <[email protected]>
Reviewed-by: Alexandre Ghiti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: ben717-linux

tools/perf/arch/riscv/util/header.c

@@ -41,7 +41,7 @@ static char *_get_cpuid(void)
 	char *mimpid = NULL;
 	char *cpuid = NULL;
 	int read;
-	unsigned long line_sz;
+	size_t line_sz;
 	FILE *cpuinfo;
 
 	cpuinfo = fopen(CPUINFO, "r");