Merge declaration and initialization.

Originally committed as revision 11701 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/common.h

@@ -96,9 +96,7 @@ extern const uint8_t ff_log2_tab[256];
 
 static inline int av_log2(unsigned int v)
 {
-    int n;
-
-    n = 0;
+    int n = 0;
     if (v & 0xffff0000) {
         v >>= 16;
         n += 16;
@@ -114,9 +112,7 @@ static inline int av_log2(unsigned int v)
 
 static inline int av_log2_16bit(unsigned int v)
 {
-    int n;
-
-    n = 0;
+    int n = 0;
     if (v & 0xff00) {
         v >>= 8;
         n += 8;