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mem: reduce noise; don't clear the allocated memory in sbrk

--- a/mem.c

+++ b/mem.c

@@ -1,6 +1,13 @@

 #include "platform.h"

-#if defined(USE_DLMALLOC)

+char *

+fl_strdup(const char *s)

+{

+	size_t sz = strlen(s)+1;

+	char *p = dlmalloc(sz);

+	memcpy(p, s, sz);

+	return p;

+}

 #if defined(__macos__)

 #include <Multiverse.h>

@@ -10,23 +17,14 @@

 	static char *e = nil;

 	if(increment == 0)

 		return e;

-	char *p = NewPtrClear(increment);

+	char *p = NewPtr(increment);

 	e = p + increment;

 	return p;

 }

 #else

-void *fl_sbrk(intptr_t increment)

+void *

+fl_sbrk(intptr_t increment)

 {

 	return sbrk(increment);

-}

-#endif

-

-char *

-fl_strdup(const char *s)

-{

-	size_t sz = strlen(s)+1;

-	char *p = dlmalloc(sz);

-	memcpy(p, s, sz);

-	return p;

 }

 #endif

--- a/meson.build

+++ b/meson.build

@@ -67,7 +67,6 @@

 platform = 'posix'

 src_common = [

-	'mem.c',

 	'nan.c',

 ]

@@ -102,6 +101,7 @@

 			language: 'c',

 		)

 		src_common += [

+			'mem.c',

 			'3rd/dlmalloc/dlmalloc.c',

 		]

 	endif