CLEANUP: remove unused code in 'my_ffsl/my_flsl' functions

Shifting the variable 'a' one bit to the right has no effect on the
result of the functions.
diff --git a/include/common/standard.h b/include/common/standard.h
index 6e1e840..ea1e86d 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -902,7 +902,6 @@
 		cnt += 2;
 	}
 	if (!(a & 0x1)) {
-		a >>= 1;
 		cnt += 1;
 	}
 #endif /* x86_64 */
@@ -946,7 +945,6 @@
 		cnt += 2;
 	}
 	if (a & 0x2) {
-		a >>= 1;
 		cnt += 1;
 	}
 #endif /* x86_64 */