librasan: Fix errno_location function name (#3172)

Author: wfdewith

libafl_qemu/librasan/asan/src/maps/libc.rs

@@ -45,7 +45,7 @@ struct FunctionErrnoLocation;
 
 impl Function for FunctionErrnoLocation {
     type Func = unsafe extern "C" fn() -> *mut c_int;
-    const NAME: &'static CStr = c"errno_location";
+    const NAME: &'static CStr = c"__errno_location";
 }
 
 static OPEN_ADDR: AtomicGuestAddr = AtomicGuestAddr::new();

libafl_qemu/librasan/asan/src/mmap/libc.rs

@@ -55,7 +55,7 @@ struct FunctionErrnoLocation;
 
 impl Function for FunctionErrnoLocation {
     type Func = unsafe extern "C" fn() -> *mut c_int;
-    const NAME: &'static CStr = c"errno_location";
+    const NAME: &'static CStr = c"__errno_location";
 }
 
 #[derive(Debug)]