common: Move flash_perror() to flash.h

This function belongs more in flash.h than common.h so move it.

Also remove the space before the bracket in some calls.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/flash.h b/include/flash.h
index 807800b..2655c72 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -117,6 +117,13 @@
 #define CFI_CMDSET_AMD_LEGACY		0xFFF0
 #endif
 
+/**
+ * flash_perror() - Print a flash error
+ *
+ * @err: Error number of message to print (ERR_... as below)
+ */
+void flash_perror(int err);
+
 /*-----------------------------------------------------------------------
  * return codes from flash_write():
  */