Remove unneeded instruction from the coldfire ffs function and fix a wrong comment

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24030 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 3 insertions, 2 deletions

diff --git a/firmware/export/system.h b/firmware/export/system.h
index d1b5df546b..505b167af9 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -205,7 +205,7 @@ int get_cpu_boost_counter(void);
 #define UNLIKELY(x) (x)
 #endif
 
-/* returns index of first set bit + 1 or 0 if no bits are set */
+/* returns index of first set bit or 32 if no bits are set */
 int find_first_set_bit(uint32_t val);
 
 static inline __attribute__((always_inline))
diff --git a/firmware/target/coldfire/ffs-coldfire.S b/firmware/target/coldfire/ffs-coldfire.S
index 582970d5d6..40a7297802 100644
--- a/firmware/target/coldfire/ffs-coldfire.S
+++ b/firmware/target/coldfire/ffs-coldfire.S
@@ -57,7 +57,8 @@ find_first_set_bit:
     | now lookup in table indexed on top 6 bits of %d0
     moveq.l #26, %d0             | %d0 = final shift count
     lsr.l   %d0, %d1             |
-    clr.l   %d0                  |
+
+    | the top 24 bits of d0 are 0 so just load the value over it
     move.b  (%a0, %d1.l), %d0    |
     rts                          |