Fix braces in if-else statements

From the Linux kernel coding guidelines:

    Do not unnecessarily use braces where a single statement will do.
    [...] This does not apply if one branch of a conditional statement
    is a single statement. Use braces in both branches.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/getstring.c

@@ -193,8 +193,9 @@ enum getstr getstring(WINDOW * win, char *str, int l, int x, int y)
       if (st.pos > 0) {
         st.pos--;
         getstr_del_char(&st);
-      } else
+      } else {
         bell();
+      }
       break;
     case CTRL('D'):            /* delete next character */
       if (st.pos < st.len)
@@ -212,8 +213,9 @@ enum getstr getstring(WINDOW * win, char *str, int l, int x, int y)
           st.pos--;
           getstr_del_char(&st);
         }
-      } else
+      } else {
         bell();
+      }
       break;
     case CTRL('K'):            /* delete to end-of-line */
       st.s[st.ci[st.pos].offset] = 0;