Tweaked debug output

- Changed "No more free space" to be an error as suggested by davidefer
- Tweaked output to be more parsable (no space between lfs and warn)

lfs.c

@@ -471,7 +471,7 @@ static int lfs_alloc(lfs_t *lfs, lfs_block_t *block) {
 
         // check if we have looked at all blocks since last ack
         if (lfs->free.ack == 0) {
-            LFS_WARN("No more free space %"PRIu32,
+            LFS_ERROR("No more free space %"PRIu32,
                     lfs->free.i + lfs->free.off);
             return LFS_ERR_NOSPC;
         }

lfs_util.h

@@ -51,28 +51,28 @@ extern "C"
 // Logging functions
 #ifdef LFS_YES_TRACE
 #define LFS_TRACE(fmt, ...) \
-    printf("lfs trace:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_trace:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_TRACE(fmt, ...)
 #endif
 
 #ifndef LFS_NO_DEBUG
 #define LFS_DEBUG(fmt, ...) \
-    printf("lfs debug:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_debug:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_DEBUG(fmt, ...)
 #endif
 
 #ifndef LFS_NO_WARN
 #define LFS_WARN(fmt, ...) \
-    printf("lfs warn:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_warn:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_WARN(fmt, ...)
 #endif
 
 #ifndef LFS_NO_ERROR
 #define LFS_ERROR(fmt, ...) \
-    printf("lfs error:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_error:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_ERROR(fmt, ...)
 #endif