Make parse_record take a const char pointer since it never modified str anyways

This shouldn't be a breaking change because it's fine to pass a
non-const pointer to a function taking a const pointer, but not the other way round

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
(cherry picked from commit 78f138c37f)
Signed-off-by: Ryan Lee <ryan.lee@canonical.com>

libraries/libapparmor/include/aalogparse.h

@@ -176,7 +176,7 @@ typedef struct
  * @return Parsed data.
  */
 aa_log_record *
-parse_record(char *str);
+parse_record(const char *str);
 
 /**
  * Frees all struct data.

libraries/libapparmor/src/libaalogparse.c

@@ -38,7 +38,7 @@
 #include "scanner.h"
 
 /* This is mostly just a wrapper around the code in grammar.y */
-aa_log_record *parse_record(char *str)
+aa_log_record *parse_record(const char *str)
 {
 	YY_BUFFER_STATE lex_buf;
 	yyscan_t scanner;

libraries/libapparmor/src/tst_aalogparse_reentrancy.c

@@ -81,7 +81,7 @@ int aa_log_record_eq(aa_log_record *record1, aa_log_record *record2) {
 }
 
 typedef struct {
-	char* log;
+	const char* log;
 	pthread_barrier_t *barrier;
 } pthread_parse_args;