Fix asan and lsan tests after #24831. NFC (#24856)

Fixes: #24852

Author: sbc100

test/fs/test_getcwd_with_non_ascii_name.c

@@ -11,8 +11,10 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+char* lastLongString;
+
 char* makeLongStr(const char* str, int strCount) {
-  char* result = malloc((strCount * strlen(str)) + 1);
+  char* result = lastLongString = realloc(lastLongString, (strCount * strlen(str)) + 1);;
   result[0] = '\0';
 
   for (int i = 0; i < strCount; ++i) {
@@ -72,4 +74,6 @@ int main() {
 
   // The negative test passes a half-sized buffer to getcwd and makes sure that it fails.
   doNegativeTest(makeLongStr(u8"abcde", 10));
+
+  free(lastLongString);
 }

test/fs/test_getdents64_special_cases.c

@@ -56,7 +56,8 @@ int main() {
 #ifndef WASMFS // The JS FS truncates filenames automatically, which is incorrect. Wasmfs and Linux do not.
   // File name exceeds the limit of 255 chars and is truncated.
   char longName[300];
-  memset(longName, 1, sizeof(longName));
+  memset(longName, '1', sizeof(longName));
+  longName[sizeof(longName) - 1] = '\0';
   doTest("test_dir2", longName);
 #endif
 }